UMC 2012 (504.3.1): Item # 38 Steve Taylor Taylor Engineering 504.3.1 Moisture Exhaust Ducts. Moisture exhaust ducts shall terminate on the outside of the building and shall be equipped with a back-draft damper. Screens shall not be installed at the duct termination. Ducts for exhausting clothes dryers shall not be connected or installed with sheet metal screws or other fasteners that will obstruct the flow. Clothes dryer moisture exhaust ducts shall not be connected to a gas vent connector, gas vent, or chimney, and shall only serve clothes dryers. Clothes dryer moisture exhaust ducts under positive pressure shall not extend into or through ducts or plenums unless sealed in accordance with SMACNA Duct Seal Class A. The duct sealing requirement would allow for ducts from the discharge of clothes dryers to traverse return air plenums. Current solutions for these instances require the ducts to be enclosed in architectural enclosures for separation or for exhaust booster fans to be located outside the building which may not be feasible. There is little risk associated with dryer exhaust air leaked into the return air plenum as it is classified as an environment air source. Any risk that does exist can be mitigated by the ducts sealed to a stringent requirement like SMACNA Seal Class A. COMMITTEE ACTION: Reject COMMITTEE STATEMENT: The proposed language permits duct leakage. The risk of clothes dryer duct leakage into supply or return ducts or plenums still exists even when sealed per Class A. 101
UMC 2012 (504.5.1): Item # 39 Ilya Rudyak Self Add new text as follows: 504.5.1 Commercial Clothes Dryer. A commercial clothes dryer shall terminate not less than 15 feet (4572 mm) from openings into a residential building. This addition provides a specific separation distance for commercial clothes dryers. The mechanical code specifies termination of environmental air ducts that include domestic and commercial clothes dryers. Commercial clothes dryers produce more lint and operate longer hours than domestic clothes dryers. COMMITTEE ACTION: Reject COMMITTEE STATEMENT: The reason statement for the proposal lacks technical substantiation by requiring fifteen feet clearance and therefore inufficient to warrant this addition. 102
UMC 2012 (506.2): Item # 40 Randy Young Sacramento Valley Chapter IAPMO 506.2 Construction. Ducts used for conveying products shall be of substantial airtight construction and shall not have openings other than those required for operation and maintenance of the system. Ducts constructed of steel shall comply with Table 5-5 or Table 5-6. Exceptions: (1) Class 1 product-conveying ducts that operate at less than four (4) inches (102 mm) water column (995.6 Pa) negative pressure and convey noncorrosive, nonflammable, and nonexplosive materials at temperatures not exceeding 250 F (121 C) may shall be permitted to be constructed in accordance with Tables 6-1, 6-2, 6-3, 6-4, 6-5, 6-7, 6-8, or, with prior approval, UMC Standard No. 6-2 SMACNA HVAC Duct Construction Standards Metal and Flexible. (remaining text unchanged) The 2009 UMC refers to an outdated 1995 SMACNA duct construction standard, and includes tables and Appendices extracted from this outdated standard. SMACNA updated this standard in 2006. It is now ANSI approved and entitled SMACNA/ANSI 006-2006 HVAC Duct Construction Standards Metal and Flexible. The outdated reference and out-of date tables and Appendices create conflict and confusion. HVAC contractors and design firms use the newer 2006 standard in their duct system design. Moreover, the 1995 version is no longer published or available. In addition, Table 17 of the 2009 UMC incorrectly identifies the new 2006 SMACNA/ANSI HVAC Duct Construction Standards as a 2005 standard. The proposal: Amends the UMC to replace the references to the outdated extracts of the 1995 SMACNA Duct Construction Standards with a reference to the 2006 SMACNA/ANSI Duct Construction Standards. Corrects the publication date of the SMACNA/ANSI Duct Construction Standards listed in Chapter 17. Eliminates Table 6-1 through Table 6-10, which contain outdated extracts from the 1995 SMACNA Duct Construction Standards. Eliminates UMC Standard No. 6-2 and UMC Standard No. 6-5 in Appendix A, which consist of simplified and outdated extracts from the 1995 SMACNA Duct Construction Standards. Moves the definition for the scope of this section that was contained in Appendix A (Section A.6.201) to the body of the code in Section 601.0 By simply referencing the 2006 SMACNA HVAC Duct Construction Standards and not replacing the deleted tables and Appendix A, the Code will be simplified and will eliminate confusion and conflict. The new standards are more complex and involved than the 1995 standards. Continuing to include outdated, partial or simplified extracts within the code may lead to inaccuracies, confusion and misapplication of the standard. Moreover, the data within the SMACNA standard has been tested and promulgated through a consensus based process and should only be used in whole. California has already adopted these proposed changes in its 2010 California Mechanical Code as a state amendment to the 2009 UMC. (look at companion change, Item # 56, 158, and 161) 103
COMMITTEE ACTION: Accept as Amended by the TC Amend proposal as follows: 506.2 Construction. Ducts used for conveying products shall be of substantial airtight construction and shall not have openings other than those required for operation and maintenance of the system. Ducts constructed of steel shall comply with Table 5-5 or Table 5-6. Exceptions: (1) Class 1 product-conveying ducts that operate at less than four (4) inches (102 mm) water column (995.6 Pa) negative pressure and convey noncorrosive, nonflammable, and nonexplosive materials at temperatures not exceeding 250 F (121 C) shall be permitted to be constructed in accordance with Tables 6-1, 6-2, 6-3, 6-4, 6-5, 6-7, 6-8, or SMACNA HVAC Duct Construction Standards Metal and Flexible. (remaining text unchanged) COMMITTEE STATEMENT: The modification permits current SMACNA document to be used in addition to Tables 6-1 through 6-8. Tables 6-1 through 6-8 provide the user a guidance for HVAC duct construction. COMMENT ON AFFIRMATIVE: RAMOCIOTTI: I wish to see the current SMACNA document to be put into the UMC to be used, in addition to the tables. The current code language provides requirements for duct construction which may or may not be available on site, therefore such requirements need to be in the body of the code. 104
UMC 2012 (507.0, Table 17-1): Item # 41 Peter Kelly State of Massachusetts Add new text as follows: 507.0 Smoke Control. Mechanical control systems shall be permitted to be installed in a vertical space connecting more than two stories in a building. The installation of mechanical control systems shall be in accordance with NFPA 92A and NFPA 92B. (renumber remaining sections) CHAPTER 17 STANDARDS TABLE 17-1 STANDARD FOR EQUIPMENT AND MATERIALS STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED SECTION NFPA 92A-2009* NFPA 92B-2009* Smoke-Control Systems Utilizing Barriers and Pressure Differences Smoke Management Systems in Malls, Atria, and Large Spaces Smoke Control Systems 507.0 Smoke Control Systems 507.0 Note: NFPA 92A and NFPA 92B were not provided for review at the time of this monograph. (portions of table not shown remain unchanged) Standard NFPA 92A includes the design, installation, acceptance testing, operation, and ongoing periodic testing of dedicated and nondedicated smoke-control systems. Standard NFPA 92B was created to provide methodologies for estimating the location of smoke within a large-volume space due to a fire either in the large-volume space or in an adjacent space. These methodologies comprise the technical basis for assisting in the design, installation, testing, operation, and maintenance of new and retrofitted smoke management systems for the management of smoke within the space where the fire exists or between spaces not separated by smoke barriers. Buildings within the scope of this standard include those with atria, covered malls, and similar large-volume spaces. This standard is not intended to apply to warehouses, manufacturing facilities, or other similar spaces. This standard does not provide methodologies to assess the effects of smoke exposure on people, property, or mission continuity. The algebraic approaches to smoke management contained in this standard assume either that the smoke removal will be by mechanical means or that the smoke will fill the large space. Both standards are needed to be referenced in the Uniform Mechanical Code for proper installation of smoke-control systems. COMMITTEE ACTION: Reject COMMITTEE STATEMENT: The proposal is an over simplification of a smoke control system. The provision for a smoke control system is already covered in the building code. 105
COMMENT ON AFFIRMATIVE: LOVELL: The last sentence should be retained and revised to read as follows: Mechanical smoke control systems shall be installed and maintained in accordance with NFPA 92A or NFPA 92B. Where such systems shall be used is covered in the building codes. The mechanical code should provide reference standards for smoke control systems, as mechanical equipments are utilized to evacuate smokes at the event of fire within a building. 106
UMC 2012 (507.0 508.0): Item # 42 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 7). 507.0 General Requirements. 507.1 Cooking equipment used in processes producing smoke or grease-laden vapors shall be equipped with an exhaust system that complies with all the equipment and performance requirements of this standard, and all such equipment and performance shall be maintained per this standard during all periods of operation of the cooking equipment. Specifically, the following equipment shall be kept in good working condition: [NFPA 96:4.1.1, 4.1.2, 4.1.3] (A) Cooking equipment (B) Hoods (C) Ducts (if applicable) (D) Fans (E) Fire suppression systems (F) Special effluent or energy control equipment All airflows shall be maintained. Maintenance and repairs shall be performed on all components at intervals necessary to maintain these conditions. [NFPA 96:4.1.3.1, 4.1.4] 507.1.4 [NFPA 96:4.1.6] 507.1.5 [NFPA 96:4.1.7] 507.1.6 [NFPA 96:4.1.8] 507.1.7 [NFPA 96:4.1.9] 507.2.5 Factory-built grease duct enclosures shall be protected with a through-penetration firestop system classified in accordance with ASTM E814 or UL 1479 having an F and T rating equal to the fire resistance rating of the assembly being penetrated from the point at which the duct penetrates a ceiling, wall or floor to the outlet terminal, and the. The factory-built grease duct protection system shall be listed in accordance with UL 2221, Standard for Tests of Fire Resistive Grease Duct Enclosure Assemblies and. The factory-built grease duct protection system shall be installed in accordance with the manufacturer s instructions and the listing requirements. [NFPA 96:4.3.3, 4.3.3.1, 4.3.3.2] 507.2.6 Field-applied grease duct enclosures shall be protected with a through penetration firestop system classified in accordance with ASTM E814 or UL 1479 having an F and T rating equal to the fire resistance rating of the assembly being penetrated. The surface of the field fabricated grease duct shall be continuously covered on all sides from the point at which the duct enclosure penetrates a ceiling, wall, or floor to the outlet terminal, and. The field-applied grease duct shall be listed in accordance with ASTM E 2336 Standard Test Methods for Fire resistive Grease Duct Enclosure Systems, and installed in accordance with the manufacturer s instructions and the listing requirements. [NFPA 96:4.3.1, 4.3.1.1, 4.3.1.2] 507.2.7 Field-applied grease duct enclosures and factory-built grease duct enclosures shall demonstrate that they provide sufficient mechanical and structural integrity, resiliency, and stability when subjected to expected building environmental conditions, duct movement under general operating conditions, and duct movement due to fire conditions. [NFPA 96:4.3.4] 507.2.7.3 Clearance Options for Field-Applied and Factory-Built Grease Duct Enclosures. The following clearance options for which field-applied grease duct enclosures and factory-built grease duct enclosures have been successfully evaluated shall be clearly identified in their listing and installation documentation and on their label: [NFPA 96:4.3.6] (1) Open combustible construction clearance at manufacturer s requested dimensions. (2) Closed combustible construction clearance at manufacturer s requested dimensions, with or without specified ventilation. (3) Rated shaft clearance at manufacturer s requested dimensions, with or without specified ventilation. 107
507.2.8 A duct shall be permitted to contact noncombustible floors, interior walls, and other noncombustible structures or supports, but it shall not be in contact for more than fifty (50) percent of its surface area per for each lineal linear foot of contact length. [NFPA 96:4.4.1] 507.2.9 [NFPA 96:4.5] 507.3 [NFPA 96:4.6] 507.4 [NFPA 96:4.7] 508.1.1 [NFPA 96:5.1.1] 508.3 Insulation materials other than electrical insulation shall have a flame-spread rating of twenty-five (25) or less when tested in accordance with UL 723, Standard for Test for Surface Burning Characteristics of Building Materials. Adhesives or cements used in the installation of insulating materials shall comply with the preceding requirements when tested with the specific insulating material. [NFPA 96:5.1.9, 5.1.10] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). 108
UMC 2012 (508.1): Item # 42.01 UMC Technical Committee Proposal 507.1.1 Cooking equipment that has been listed in accordance with UL 197 or an equivalent standard for reduced emissions shall not be required to be provided with an exhaust system. [NFPA 96:4.1.1.1*] 507.1.2 The listing evaluation of cooking equipment covered by Section 507.1.1 shall demonstrate that the grease discharge at the exhaust duct of a test hood placed over the appliance shall not exceed 5 mg/m 3 when operated with a total airflow of 0.236 cubic meters per second (500 cfm). [NFPA 96:4.1.1.2] 508.1 Where Required. Hoods shall be installed at or above all commercial-type deep fat fryers, broilers, fry grills, steamjacketed kettles, hot-top ranges, ovens, barbecues, rotisseries, dishwashing machines, and similar equipment that produces comparable amounts of steam, smoke, grease, or heat in a food-processing establishment. For the purpose of this section, a food-processing establishment shall include any building or portion thereof used for the processing of food, but shall not include a dwelling unit. Exceptions: (1) Cooking appliance that has been listed in accordance with EPA 202 for reduced emissions where the grease discharge does not exceed 5 mg/m 3 when operated with a total airflow of 0.236 cubic meters per second (500 cfm). (2) Recirculating systems listed in accordance with UL 710B and installed in accordance with Section 516.0. The proposed text clarifies the exceptions when the commercial kitchen hood is not required. 109
UMC 2012 (509.0 509.1, 509.2.3, 509.2.4.1): Item # 43 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 8). 509.0 Grease Removal Devices in Hoods. 509.1 Grease Removal Devices. Listed grease filters, baffles, or other approved grease removal devices for use with commercial cooking equipment shall be provided. Listed grease filters shall be tested in accordance with UL 1046, Grease Filters for Exhaust Ducts. Mesh filters shall not be used. [NFPA 96:6.1.1 6.1.3] 509.2.3 Grease Removal Device Protection. Grease removal devices shall be protected from combustion gas outlets and from direct flame impingement occurring during normal operation of cooking appliances producing high flue gas temperatures, such as deep-fat fryers or upright or high broilers (salamander broilers), where the distance between the grease removal device and the appliance flue outlet (heat source) is less than eighteen (18) inches (457 mm). [NFPA 96:6.2.2.1] 509.2.4.1 Filters shall be tight fitting and firmly held in place and Ggrease filters shall be arranged so that all exhaust air passes through the grease filters. [NFPA 96:6.2.3.3] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). Furthermore, this change removes unenforceable language from the body of the Code and to ensure that each section only contains one requirements. COMMITTEE ACTION: Accept as Amended by the TC Amend proposal as follows: 509.2.4.1 Filters shall be tight fitting and firmly held in place and Ggrease filters shall be arranged so that all exhaust air passes through the grease filters. [NFPA 96-04:6.2.3.3] COMMITTEE STATEMENT: The phrase from Section 509.2.4.1 is necessary to provide direction to the installer for the placement of a grease filter. 110
UMC 2012 (510.0 511.0): Item # 44 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 9). 510.0 Exhaust Duct Systems. 510.1 General. 510.1.1 [NFPA 96:7.1.1] 510.1.2 [NFPA 96:7.1.2] 510.1.3 [NFPA 96:7.1.3] 510.1.4 All ducts shall be installed without forming dips or traps that might collect residues. [NFPA 96:7.1.2] In manifold (common duct) systems, the lowest end of the main duct shall be connected flush on the bottom with the branch duct. [NFPA 96:7.1.3] Duct systems serving a Type I hood shall be so constructed and installed that grease cannot become pocketed in any portion thereof, and the system shall slope not less than 1/4 inch per lineal foot (21 mm/m) toward the hood or toward an approved grease reservoir. Where horizontal ducts exceed seventy-five (75) feet (22,860 mm) in length, the slope shall be not less than one (1) inch per lineal foot (83 mm/m). 510.1.5 [NFPA 96:7.1.5] 510.1.6 [NFPA 96:7.1.6] 510.2 Clearance. 510.2.1 [NFPA 96:7.2] 510.3 Openings. 510.3.1 Openings shall be provided at the sides or at the top of the duct, whichever is more accessible, and at changes of direction. Openings shall be protected by approved access panels that in accordance with Section 510.3.4.5. Exception: Openings shall not be required in portions of the duct that are accessible from the duct entry or discharge. [NFPA 96:7.3.3] 510.3.4 Openings in Ducts. Openings shall conform be in accordance with the requirements of Sections 510.3.4.1 through 510.3.4.5. [NFPA 96:7.4] 510.3.4.1.1 Horizontal ducting shall be secured sufficiently to allow for the weight of personnel entry into the duct. Where an opening of this size is not possible, openings large enough to permit thorough cleaning shall be provided at twelve (12) feet (3,658 mm) intervals. [NFPA 96:7.4.1.2] 510.3.4.4 Access Panels. Access panels shall be of the same material and thickness as the duct (Section 510.5.1). Access panels shall have a gasket or sealant that is rated for 1,500 F (815.6 C) and shall be grease-tight. Fasteners, such as bolts, weld studs, latches, or wing nuts, used to secure the access panels shall be carbon steel or stainless steel and shall not penetrate duct walls. [NFPA 96:7.4.3.1-7.4.3.3] Exception: Listed grease duct access door assemblies (access panels) shall be installed in accordance with their terms of the listings and the manufacturer s instructions. [NFPA 96:7.4.3.4] 510.3.4.5 [NFPA 96: 7.4.4.1, 7.4.4.2] 510.5 Other Grease Ducts. [NFPA 96:7.5] 510.5.1 Materials. [NFPA 96:7.5.1.1] 111
510.5.2 Installation. 510.5.2.1 All sseams, joints, penetrations, and duct-to-hood collar connections shall have a liquid-tight continuous external weld. [NFPA 96:7.5.2.1] Exception No. 1: Duct-to-hood collar connections as shown in Figure 5-2 shall be permitted. shall not require a liquid-tight continuous external weld. [NFPA 96:7.5.2.2] Exception No. 2: Penetrations shall be permitted to be sealed by other listed devices that are tested to be grease-tight and are evaluated under the same conditions of fire severity as the hood or enclosure of listed grease extractors and whose presence does not detract from the hood s or duct s structural integrity. [NFPA 96:7.5.2.3] Exception No. 3: Internal welding shall be permitted, provided the joint is formed or ground smooth and is readily accessible for inspection. [NFPA 96:7.5.2.4] 510.6 Exterior Installations. 510.6.1 [NFPA 96:7.6.1-7.6.3] 510.7 Interior Installations. 510.7.1 In all buildings more than one story in height, and in one-story buildings where the roof-ceiling assembly is required to have a fire resistance rating, the ducts shall be enclosed in a continuous enclosure extending from the lowest fire-rated ceiling or floor above the hood, through any concealed spaces, to or through the roof so as to maintain the integrity of the fire separations required by the applicable Building Code provisions. The enclosure shall be sealed around the duct at the point of penetration of the lowest fire-rated ceiling or floor above the hood in order to maintain the fire resistance rating of the enclosure and shall be vented to the exterior of the building through weather-protected openings. [NFPA 96:7.7.1.2-7.7.1.4] Exception: The continuous enclosure provisions shall not be required where a field-applied grease duct enclosure or a factorybuilt grease duct enclosure (see Section 507.2.3) is protected with a listed duct-through-penetration protection system equivalent to the fire resistance rating of the assembly being penetrated, and the materials are installed in accordance with the conditions of their listings and the manufacturers instructions and are acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.1.5] 510.7.2 The enclosure required in Section 510.7.1 shall conform to Sections 510.7.2.1 through 510.7.2. 510.7.2.1 If the Bbuilding is less than four stories in height, the enclosure wall shall have a fire resistance rating of not less than one (1) hour. [NFPA 96: 7.7.2.1.1] 510.7.2.2 If the Bbuilding is four stories or more in height, the enclosure wall shall have a fire resistance rating of not less than two (2) hours. [NFPA 96: 7.7.2.1.2] 510.7.2.3 Clearance from the duct or the exhaust fan to the interior surface of enclosures of combustible construction shall be not less than eighteen (18) inches (457 mm), and clearance from the duct to the interior surface of enclosures of noncombustible or limited-combustible construction shall be not less than six (6) inches (152 mm). Provisions for reducing clearances as described in Section 507.2 are not applicable to enclosures. [NFPA 96: 7.7.2.2.1-7.7.2.2.3] Exception: Clearance from the outer surfaces of field-applied grease duct enclosures and factory-built grease duct enclosures to the interior surfaces of construction installed around them shall be permitted to be reduced where the field-applied grease duct enclosure materials and the factory-built grease duct enclosures are installed in accordance with the conditions of their listings and the manufacturers instructions and are acceptable to the Authority Having Jurisdiction. [NFPA 96: 7.7.2.2.4] 510.7.3.1 Field-applied grease duct enclosures and factory-built grease duct enclosures shall demonstrate that they provide sufficient mechanical and structural integrity, resiliency, and stability when subjected to expected building environmental conditions, duct movement under general operating conditions, and duct movement due to as a result of interior and exterior fire conditions. [NFPA 96:7.7.2.2.5] 510.7.3.2 Measures shall be taken to prevent physical damage to any covering or enclosure material. Any damage to the covering or enclosure shall be repaired and the covering or enclosure shall be restored to meet its intended listing and fire-resistive rating and to be acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.3.1, 7.7.3.2] 510.7.3.3 [NFPA 96:7.7.3.3] 510.7.5 If openings in the Where enclosure walls are provided, they shall be protected by listed approved self-closing fire doors of proper rating. Fire doors shall be installed in accordance with NFPA 80, Standard for Fire Doors and Fire Windows. Openings on other listed materials or products shall be clearly identified and labeled according to the terms of the listing and the manufacturer s instructions and shall be acceptable to the Authority Having Jurisdiction. The panels shall be readily accessible. [NFPA 96:7.7.4.1-7.7.4.3] 510.7.6 [NFPA 96:7.7.5.1, 7.7.5.2] 112
510.8 Termination of Exhaust System. 510.8.1 [NFPA 96:7.8.1] (A) [NFPA 96:7.8.1(1)] (B) [NFPA 96:7.8.1(2)] 510.8.2 Rooftop Terminations. 510.8.2.1 [NFPA 96:7.8.2.1] (C) [NFPA 96:7.8.2.1(4), 7.8.2.1(5)] (D) [NFPA 96: 7.8.2.1(7)] 510.8.3 Wall Terminations. 510.8.3.1 Wall terminations shall be arranged with or provided with the following properties: [NFPA 96: 7.8.3] (A) Through a noncombustible wall with a minimum of ten (10) feet (3,048 mm) of clearance from the outlet to adjacent buildings, property lines, grade level, combustible construction, or electrical equipment or lines, and the closest point of any air intake or operable door or window at or below the plane of the exhaust termination. The closest point of any air intake or operable door or window above the plane of the exhaust termination shall be a minimum of ten (10) feet (3,048 mm) in distance, plus 0.25 feet (0.076m) 3 inches (76 mm) for each one (1) degree from horizontal, the angle of degree being measured from the center of the exhaust termination to the center of the air intake or operable door or window. (See Figure 5-4.) [NFPA 96:7.8.3(1), 7.8.3(2)] Exception: A wall termination in a secured area can shall be permitted to be at a lower height above grade if acceptable to the Authority Having Jurisdiction. [NFPA 96:7.8.3(3)] (B) [NFPA 96:7.8.3(4)] (C) [NFPA 96:7.8.3(5)] (D) [NFPA 96:7.8.3(6)] (E) [NFPA 96:7.8.3(7)] 511.1.1 [NFPA 96:8.1.1.1, 8.1.1.2] 511.1.5 [NFPA 96:8.1.5.1, 8.1.5.2] 511.2.3 Exhaust-air volumes for hoods shall be of sufficient level to provide for capture and removal of grease-laden cooking vapors. Test data, performance acceptable to the Authority Having Jurisdiction, or both, shall be provided, displayed, or both, upon request. [NFPA 96:8.2.2.1, 8.2.2.2] Exception: Lower exhaust-air volumes shall be permitted during no-load cooking conditions, provided they are sufficient to capture and remove flue gases and residual vapors from cooking equipment. [NFPA 96:8.2.2.3] 511.4.6 Such mmeans to adjust the bleed air quality shall be installed in between the fire damper and the source of bleed air. [NFPA 96:8.4.6] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). 113
UMC 2012 (510.5.2.2 510.5.2.4, Figure 5-3, Figure 510.5.2.2(1) Figure 510.5.2.2(4)) Item # 45 Erik S. Emblem 3E International Inc./Rep. California SMACNA California SMWIA Local Unions 510.5.2.2 Overlapping duct connections of either the telescoping or the bell type shall be used for welded field joints, not buttweld connections. The inside duct section shall always be uphill of the outside duct section. The difference between inside dimensions of overlapping sections shall not exceed 1/4 inch (6.4 mm). The overlap shall not exceed two (2) inches (50.8 mm). (See Figure 5-3.) Welded Duct Connection. Duct-to-duct connection shall be as follows: [NFPA 96:7.5.5.1] (1) Telescoping joint, as shown in Figure 510.5.2.2(1). (2) Bell type joint, as shown in Figure 510.5.2.2(2). (3) Flange with edge weld, as shown in Figure 510.5.2.2(3). (4) Flange with filled weld, as shown in Figure 510.5.2.2(4). Figure 5-3 Telescoping and Bell-Type Duct Connections. [NFPA 96:7.5.5.1(a)(b)] 114
For SI units: 1 inch = 25.4 mm Notes: 1. Duct size decreases (going upward) with each telescope. 2. Smaller (inside) duct section is always above or uphill (on sloped duct), to be self draining into larger (outside) duct. FIGURE 510.5.2.2(1) TELESCOPING-TYPE DUCT CONNECTION [NFPA 96: FIGURE 7.5.5.1(a)] For SI units: 1 inch = 25.4 mm Notes: 1. Duct size stays the same throughout the duct system. 2. Smaller (inside) male duct end is always above or uphill (on sloped duct, to be self-draining into larger (outside female duct end). FIGURE 510.5.2.2(2) BELL-TYPE DUCT CONNECTION [NFPA 96: FIGURE 7.5.5.1(b)] 115
FIGURE 510.5.2.2(3) FLANGE WITH EDGE WELD DUCT CONNECTION [NFPA 96: FIGURE 7.5.5.1(c)] FIGURE 510.5.2.2(4) FLANGE WITH FILLED WELD DUCT CONNECTION [NFPA 96: FIGURE 7.5.5.1(d)] 510.5.2.3 Butt Welded Connections. Butt welded connections shall not be permitted. [NFPA 96:7.5.5.2] 510.5.2.4 Inside Duct Section. For telescoping and bell-type connections, the inside duct section shall be uphill of the outside duct section. [NFPA 96:7.5.5.3] NFPA 96 is the Standard adopted by Fire Marshalls and included in State Fire Codes, the 2009 UMC omitted several acceptable Welded Duct Connections provided in Standard 96. This proposal will eliminate ambiguity between the UMC, State Fire Codes and Fire Marshalls interpretations. 116
UMC 2012 (511.1.3 511.1.3.3): Item # 46 Steve Taylor Taylor Engineering 511.1.3 Utility set exhaust fans, if installed at the rooftop termination point, shall meet the requirements of Sections 510.8.2.1(A) and Section 510.8.2.3. If the fan is installed within the building, it shall be located in an easily accessible area of adequate size to allow for service or removal. If the duct system connected to the fan is in an enclosure, the space or room in which the exhaust fan is located shall have the same fire resistance rating as the enclosure. The fan shall be connected to the exhaust duct by flanges securely bolted as shown in Figures 5-6(a) through 5-6(d) or by a system specifically listed for such use. Flexible connectors shall not be used. Exhaust fans shall have a drain directed to a readily accessible and visible grease receptacle not to exceed one (1) gallon (3.8 L). [NFPA 96:8.1.3.1-8.1.3.6] 511.1.3 Utility set exhaust fans. Utility set exhaust fans shall be installed in accordance with Section 511.1.3.1 through Section 511.1.3.3. 511.1.3.1 At the Rooftop. Fans installed at the rooftop termination point shall be in accordance with the following: (1) Section 510.8.2.1(A) and Section 510.8.2.3. (2) Flexible connectors shall be permitted. (3) A drain shall be directed to a readily accessible and visible grease receptacle not to exceed 1 gallon (3.8 L). 511.1.3.2 Within the Building. Fans installed within the building shall be in accordance with the following: (1) Located in an easily accessible area of adequate size to allow for service or removal. (2) Flexible connectors shall be prohibited. (3) A drain shall be directed to a readily accessible and visible grease receptacle not to exceed 1 gallon (3.8 L). [NFPA 96:8.1.3.1-8.1.3.6] 511.1.3.3 Duct Systems. Duct systems, connected to fans, in an enclosure shall be in accordance with the following: (1) The space or room in which the exhaust fan is located shall have the same fire resistance rating as the enclosure. (2) The fan shall be connected to the exhaust duct by flanges securely bolted as shown in Figure 5-6(a) through Figure 5-6(d) or by a system specifically listed for such use. Section 511.1.3 is not clearly written to allow for users to understand what is and is not allowed. Specifically, it states that flexible connectors shall not be used. This statement only applies to the fans located within the building which is stated four sentences previous to this sentence. The section does not make it clear that flexible connectors may be allowed on fans installed at the rooftop termination point. The proposed reorganization does not revise any statements but organizes them in a bulleted list to add clarity. The statement allowing flexible connectors is added to the section describing fans mounted outside to explicitly state this allowance rather than imply it. 117
UMC 2012 (511.2.1): Item # 47 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 4). 511.2.1 The air velocity through any duct shall be not less than 500 feet per minute (152.4 meters per minute) and not more than 2,500 feet per minute (12.7 m/s). Exception: Transition duct sections shall be permitted to be connected to hoods and exhaust fans that do not meet this velocity, provided that they do not exceed three (3) feet (914 mm) in length and do not contain traps for grease. Exception of Section 511.2.1 means the same as Section 511.2.2. The language in Section 511.2.2 is preferred, in order to correlate with NFPA 96-2008. For informational purposes, Section 511.2.2 is show as follows: Transition duct sections that do not exceed three (3) feet (914 mm) in length and do not contain grease traps shall be permitted to be connected to hoods and exhaust fans that do not meet this velocity. [NFPA 96:8.2.1.2] 118
UMC 2012 (TIA UMC 004-09 Section 511.2.1): Item # 48 Ted Lemoff Chair, UMC Grease Duct Air Velocity Task Group The following is recommended by the Grease Duct Air Velocity Task Group (see Grease Duct Air Velocity Task Group Report Item 1). 511.2.1 The air velocity through any duct shall be not less than 500 feet per minute (152.4 meters per minute) and not more than 2500 feet per minute (ft/min) (12.7 m/s). [NFPA 96:8.2.1.1] Technical Merit: From 1976 through 2006 the mechanical code contained prescriptive limits for airflow in a kitchen grease duct; 1500 feet per minute (minimum) to 2500 feet per minute (maximum). At the 2008 IAPMO Assembly Meeting the code change proposal to reduce the minimum to 500 feet per minute was amended by a public comment to include the removing of the maximum limit of 2500 feet per minute. NFPA 96-2008 cites ASHRAE Research Project 1033-RP Final Report, documented which documents that an increase in velocity through the grease duct increased grease deposition due primarily to increased turbulence at the duct surface. The testing was done to justify allowing slower (500 feet per minute) velocities (previously 1500 feet per minute was the minimum) in duct design. The study addressed velocities of 500, 1000, 1500, and 2000 feet per minute. Emergency Nature: The need for an upper limit on duct velocity is needed because at higher velocities the particles in the air stream will impact a duct wall and collect on the inner surface. This accumulation can increase the frequency of grease system maintenance and duct cleaning. It could also be a fire hazard. A limit is therefore added, based on a previous code requirement which was not reported to be problematic. This change has been approved by the UMC Technical Committee through the Tentative Interim amendment process. In addition, the IAPMO Standards Council supported the UMC TC decision on October 15, 2009. 119
UMC 2012 (511.2.4): Item # 49 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 5). 511.2.4 A hood exhaust fan(s) shall continue to operate after the extinguishing system has been activated, unless fan shutdown is required by a listed component of the ventilation system or by the design of the extinguishing system. It shall not be required to restart the hood exhaust fan when the extinguishing system is activated if the exhaust fan and all cooking equipment served by the fan had previously been shut down. The hood exhaust fan shall not be required to start upon activation of the extinguishing system if the exhaust fan and all cooking equipment served by the fan have previously been shut down. [NFPA 96:8.2.3.1-8.2.3.2] This deletion eliminates duplication of code language within Section 511.2.4. 120
UMC 2012 (512.2.3, 512.3 512.3.3): Item # 50 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 10). 512.2.3 Lighting units on hoods shall not be located in concealed spaces except as permitted by Section 512.2.4 and Section 512.2.5. [NFPA 96:2.3.2] 512.3 Other Equipment. 512.3.1 Fume incinerators, thermal recovery units, air pollution control devices, or other devices shall be permitted to be installed in ducts or hoods or to be located in the path of travel of exhaust products where specifically approved for such use. Downgrading other parts of the exhaust system due to the installation of these approved devices, whether listed or not, shall not be allowed. [NFPA 96:9.3.1-9.3.2] 512.3.2 Any equipment, listed or otherwise, that provides secondary filtration or air pollution control and that is installed in the path of travel of exhaust products shall be provided with an approved automatic fire-extinguishing system, installed in accordance with fire-extinguishing system manufacturer s instructions, for the protection of the component sections of the equipment and shall include protection of the ductwork downstream of the equipment, whether or not the equipment is provided with a damper. Filter media used in secondary filtration or air pollution control units and not complying with Section 509.2.4 shall have fire protection that is adequate for the filter media being used in accordance with the fire-extinguishing system manufacturer s instructions. If the equipment can be provides a source of ignition, it shall be provided with appropriate detection to operate the fire-extinguishing system protecting the equipment. [NFPA 96:9.3.3, 9.3.3.1, 9.3.4] 512.3.3 Where a cooking exhaust system employs an air pollution control device that recirculates air into the building, the provisions requirements of Section 516.0 shall apply. [NFPA 96:9.3.5] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). It is important that the protection utilized in a secondary filtration or air pollution control unit be approved for kitchen use. However, as there is no protection specifically listed for this type of equipment, as due to the variation in size and filter media configurations, it is important that direction be given by the manufacturer. 121
UMC 2012 (513.0): Item # 51 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 11). 513.1.2 Cooking equipment that produces grease-laden vapors (such as, but not limited to, deep-fat fryers, ranges, griddles, broilers, woks, tilting skillets, and braising pans) and can be a source of ignition of grease in the hood, grease removal device, or duct shall be protected by fire-extinguishing equipment. [NFPA 96:10.1.2] 513.2.1.1 A placard identifying the use of the extinguisher as secondary backup means to the automatic fire-extinguishing suppression system shall be conspicuously placed near each portable fire extinguisher in the cooking area. [NFPA 96:10.2.2] 513.2.2 Automatic fire-extinguishing systems shall comply with standard UL 300, Fire Testing of Fire Extinguishing Systems for Protection of Restaurant Cooking Areas, or other equivalent standards and shall be installed in accordance with their the requirements of the listings. [NFPA 96:10.2.3] Exception: Automatic fire-extinguishing equipment provided as part of listed recirculating systems complying with standard UL 710B, Outline of Investigation for Recirculating Exhaust System. [NFPA 96:10.2.5] 513.2.5.3 The water wash in the fixed baffle hood specifically listed to extinguish a fire shall be activated by the cooking equipment extinguishing system. [NFPA 96:10.2.8.5] 513.2.6 Water Valve Supervision. [NFPA 96:10.2.10] (1) [NFPA 96:10.2.10(1)] (2) [NFPA 96:10.2.10(2)] (3) [NFPA 96:10.2.10(3)] (4) [NFPA 96:10.2.10(4)] 513.5 Manual Activation. 513.5.1 A readily accessible means for manual activation shall be located between forty-two (42) inches and forty-eight (48) inches (1,067 mm and 1,219 mm) above the floor, be accessible in the event of a fire, be located in a path of exit or of egress, and clearly identify the hazard protected. A manual actuation device shall be located not less than a minimum of ten (10) feet (3 m) when possible and less than a maximum of twenty (20) feet (6 m) from the protected kitchen appliance(s) within the path of egress. Manual actuation using a cable-operated pull station shall not require more than forty (40) pounds (178 N) of force, with a pull movement not to exceed fourteen (14) inches (356 mm) to actuate the fire suppression system. The automatic and manual means of system activation external to the control head or releasing device shall be separate and independent of each other so that failure of one will not impair the operation of the other. [NFPA 96:10.5.1 10.5.2] 513.5.4 The means for manual actuator(s) shall be mechanical or rely on electrical power for actuation activation in accordance with Section 513.5.5. [NFPA 96:10.5.5] 513.7.1 Where electrical power is required to operate the automatic fire-extinguishing system, it the system shall be monitored by a supervisory alarm, with a standby power supply provided. [NFPA 96:10.7.1] 513.10.1 Installation of systems shall be performed only by persons properly trained and qualified to install the specific system being provided. The installer shall provide certification to the Authority Having Jurisdiction that the installation is in agreement with the terms of the listing and the manufacturer s instructions and/or, approved design or both. [NFPA 96:10.9.2] 122
513.11.1 Portable fire extinguishers shall be installed in kitchen cooking areas in accordance with NFPA 10, Standard for Portable Fire extinguishers, and shall be specifically listed for such use. Such extinguishers shall use agents that saponify upon contact with hot grease, such as sodium bicarbonate and potassium bicarbonate dry chemical and potassium carbonate solutions. Class B gas-type portables such as CO 2 and halon shall not be permitted in kitchen cooking areas. Manufacturer s recommendations shall be followed. [NFPA 96:10.10.1 10.10.4] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). VOTING RESULTS: AFFIRMATIVE: 17, NEGATIVE: 3, NOT RETURNED: 1 Nikravi EXPLANATION OF NEGATIVE: ADLER, MANN: Examples of cooking appliances producing grease laden vapors in Section 513.1.2 do not violate the principles of the Uniform Mechanical Code. The use of examples clarifies the intent of the code for the end user, including the Authority Having Jurisdictions. FEEHAN: A list of cooking appliances producing grease-laden vapors in Section 513.1.2 helps to clarify the intent of the code for the user. I agree with the rest of changes in this code proposal. 123
UMC 2012 (514.2.1 514.2.3, 514.2.5, 514.3.1): Item # 52 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 12). 514.2.1 All actuation components, including remote manual pull stations, mechanical or electrical devices, detectors, and actuators, and fire-actuated dampers, shall be checked for proper operation during the inspection in accordance with the manufacturer s listed procedures. In addition to these requirements, the specific inspection and maintenance requirements of the extinguishing system standards as well as the applicable listed installation and maintenance manuals and service bulletins requirements of the applicable NFPA standard shall also be followed. [NFPA 96-04:11.2.2-11.2.3] 514.2.2 Fusible links (including fusible links on fire damper assemblies) and automatic sprinkler heads shall be replaced at least semiannually, or more frequently if necessary where required by the manufacturer. [NFPA 96-04:11.2.4] 514.2.3 The year of manufacture and the date of installation of the fusible links shall be marked on the system inspection tag. The tag shall be signed or initialed by the installer. [NFPA 96:11.2.5] Other Ddetection devices other than not including fusible links and automatic sprinklers shall be serviced or replaced in accordance with the manufacturer s recommendations. [NFPA 96-04:11.2.6] 514.2.5 If Where required, certificates of inspection and maintenance shall be forwarded to the Authority Having Jurisdiction. [NFPA 96:11.2.8] 514.3.1 The entire exhaust system shall be inspected for grease buildup by a properly trained, qualified, and certified company or person(s) acceptable to the Authority Having Jurisdiction and in accordance with Table 5-4. [NFPA 96:11.4] This change recommends revisions that were made to text extracted from NFPA (2008 edition). Maintenance and inspections requirements vary per the type of system installed and are specified in the applicable standards e.g. NFPA 12, NFPA 13, NFPA 17, and NFPA 17A. In addition, it is necessary to have listed maintenance manuals and bulletins for the work described in Section 514.2.1. COMMENT ON AFFIRMATIVE: LOWELL: I agree with deleting the reference to fire dampers, however smoke dampers have actuators that must be inspected and should be included in this list of inspected items. 124
UMC 2012 (515.0 516.0): Item # 53 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 13). 515.1.1 [NFPA 96:12.1.1] (A) [NFPA 96:12.1.1(1)] (B) [NFPA 96:12.1.1(2)] 515.3 Cooking Equipment Maintenance. 515.3.1 [NFPA 96:11.57.1] 515.3.2 [NFPA 96:11.57.2] 516.2.2 Recirculating systems shall be listed with a testing laboratory. The rrecirculating system listing shall include integral fire protection for recirculating hoods, including canopy type. [NFPA 96:13.2.4.1] 516.2.8 The power supply of any electrostatic precipitator (ESP) shall be of the cold spark, ferroresonant type in that which the voltage falls off as the current draw of a short increases. [NFPA 96:13.2.11] 516.3.4 [NFPA 96:13.3.5.1 13.3.5.3] 516.4 Location and Application Restrictions. [NFPA 96:13.4.1, 13.4.2] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). Although recirculating single appliance/hood combinations incorporate integral fire protection that is part of the overall listing, many recirculating canopy type hoods do not have listed fire protection. Manufacturers of these types of hoods have been recommending using UL 300 protection. However, UL 300 does not have provision for testing or listing fire protection for this type of hood. COMMITTEE ACTION: Accept as Amended by the TC Amend proposal as follows: 516.2.2 Recirculating systems shall be listed with a testing laboratory in accordance with UL 710B or equivalent. Recirculating system listing shall include integral fire protection for recirculating hoods, including canopy type. [NFPA 96:13.2.4.1] COMMITTEE STATEMENT: The modification is to make the UMC consistent with NFPA 96-2008. 125
UMC 2012 (517.1 517.7.8): Item # 54 Martin Cooper Chair, UMC Correlation Task Group The following is recommended by the Correlation Task Group (see Correlation Task Group Report Item 14). 517.1 Venting Application. [NFPA 96:14.1] 517.1.1 [NFPA 96:14.1.1] 517.1.2 [NFPA 96:14.1.2] 517.1.3 [NFPA 96:14.1.3] 517.1.4 [NFPA 96:14.1.4] 517.1.5 [NFPA 96:14.1.5] 517.1.6 [NFPA 96: 14.1.6, 14.1.7] 517.2 Location of Appliances. 517.2.1 [NFPA 96:14.2.1] 517.2.2 Solid-fuel cooking appliances shall not be installed in confined spaces. [NFPA 96:14.2.2] Exception: Solid-fuel cooking appliances listed for installation in confined spaces such as alcoves shall be installed in accordance with the terms of the listing and the manufacturer s instructions. [NFPA 96:14.2.3] 517.2.3. [NFPA 96:14.2.4] 517.3 Hoods for Solid-Fuel Cooking. 517.3.1 [NFPA 96:14.3.1, 14.3.2] 517.3.2 Exhaust systems serving All solid-fuel cooking equipment, including gas or electrically operated equipment, served by hood and duct systems shall be separate from all other exhaust systems. [NFPA 96:14.3.3] Exception: Cooking equipment not requiring automatic fire-extinguishing equipment (as per the provisions of Section 510.0) shall be permitted to be installed under a common hood with solid-fuel cooking equipment that is served by a duct system separate from all other exhaust systems. [NFPA 96:14.3.5] 517.4 Exhaust Systems for Solid-Fuel Cooking. [NFPA 96:14.4] 517.4.1 If a hood is used in buildings where, the duct system is three stories or less in height, the duct system shall conform with the Section 510.0. [NFPA 96:14.4.1] 517.4.2 [NFPA 96:14.4.2] 517.4.3 [NFPA 96:14.4.3] 517.4.4 [NFPA 96:14.4.4] 517.5 Grease Removal Devices for Solid-Fuel Cooking. NFPA 96:14.5.1] 517.5.1 [NFPA 96:14.5.2] 517.5.2 [NFPA 96:14.5.3] 517.6 Air Movement for Solid-Fuel Cooking. [NFPA 96:14.6.1] 517.6.1 [NFPA 96:14.6.2] 517.6.2 [NFPA 96:14.6.3] 517.7 Fire-Extinguishing Equipment for Solid-Fuel Cooking. 517.7.1 Approved fire-extinguishing equipment shall be provided to protect all solid-fuel-burning cooking appliances that might be a source of ignition of grease in the hood, grease removal device, or duct. Exception: If Where acceptable to the Authority Having Jurisdiction, solid-fuel-burning cooking appliances constructed of solid masonry or reinforced portland or refractory cement concrete and vented in accordance with NFPA 211, Standard for 126
Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances, Chapters 3 and 4, shall not require fixed automatic fire-extinguishing equipment. [NFPA 96:14.7.2] 517.7.2 [NFPA 96:14.7.3] Exception: If Where acceptable to the Authority Having Jurisdiction, solid-fuel-burning cooking appliances constructed of solid masonry or reinforced portland or refractory cement concrete and vented in accordance with NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances, Chapters 3 and 4, shall not require automatic fire-extinguishing equipment for the protection of grease removal devices, hoods, and duct systems. [NFPA 96:14.7.4] 517.7.3 [NFPA 96:14.7.5] 517.7.4 [NFPA 96:14.7.6, 14.7.7] 517.7.6 Solid-fuel appliances with fireboxes exceeding five (5) ft. 3 cubic feet (0.14 m 3 ) shall be provided with a fixed-waterpipe system with a hose in the immediate vicinity of the appliance kitchen capable of reaching the firebox. The hose shall be equipped with an adjustable nozzle capable of producing a fine to medium spray or mist. The nozzle shall be of the type that cannot produce a straight stream. The system shall have a minimum operating pressure of forty (40) psi (275.8 kpa) and shall provide a minimum of five (5) gpm. [NFPA 96:14.7.9.1 14.7.9.2] 517.7.7 [NFPA 96:14.7.10] 517.7.8 [NFPA 96:14.7.11] This change recommends revisions that were made to text extracted from NFPA 96 (2008 edition). Combination cooking equipment is not currently addressed in Section 517.3.2. Solid fuel can be utilized in gas or electrically operated equipment, generally for smoke flavoring, but it is also a source for embers and Class A products of decomposition. 127