CUMULATIVE ANALYSIS OF UNIFORM MECHANICAL CODE CHANGES to 2003

Transcription

1 CUMULATIVE ANALYSIS OF UNIFORM MECHANICAL CODE CHANGES 2000 to 2003

2 The following pages contain comments regarding the changes to the 2000 edition of the UNIFORM MECHANICAL CODE (UMC ) that were made to develop the 2003 edition of the UMC. Some of the comments made are general in nature because the existing language was significantly changed by amendment, deletion or replacement of existing code language. Deleted language is shown by strikeouts and new language is underlined (when possible). Besides minor section changes that occurred within the book to keep section numbers consistent and in order, two general term changes were also made throughout the entire Code book. 1) Administrative Authority Authority Having Jurisdiction 2) Chapter 16, Part II Chapter 17, Part II Section Administrative Authority is the individual official, board, depart, or agency established and authorized by the stat, county, city, or other political subdivision created by law to administer and enforce the provisions of the mechanical code as adopted or amended. This definition shall include the Administrative Authority s duly authorized representative. Authority Having Jurisdiction The organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, installations, or procedures. The authority having jurisdiction shall be a federal, state, local or other regional department or an individual such as a plumbing official; mechanical official; labor department official; health department official; building official or others having statutory authority. In the absence of a statutory authority, the authority having jurisdiction may be some other responsible party. This definition shall include the Authority Having Jurisdiction s duly authorized representative. Analysis: The term Administrative Authority has been deleted and replaced by the term Authority Having Jurisdiction in all of the chapters and sections of the UMC. This change was made to make the code consistent with language used in other codes and standards. This change also makes the term consistent with the IAPMO rules and regulations. Section New definitions for Brine, Building Code, and Building Official Brine. As determined in accordance with NFPA 30 Building Code is the building code that is adopted by this jurisdiction Building Official. See Authority Having Jurisdiction.

3 Analysis: This adds new required definitions to Chapter 2. The term code has been amended to make the code consistent with language used in other codes and standards. This change also makes the term consistent with the IAPMO rules and regulations. Section New definitions for Clothes Dryer, Type 1, Clothes Dryer, Type 2, Code, and Combustion Air. Clothes Dryer, Type I is a factory-built package, multiply produced. Primarily used in family living environment. May or may not be coin operated for public use. Clothes Dryer, Type II is a factory-built package, multiply produced. Used in business with direct intercourse of the function with the public. May or may not be operated by public or hired attendant. May or may not be coin operated. Code A standard that is an extensive compilation of provisions covering broad subject matter or that is suitable for adoption into law independently of other codes and standards. Analysis: This adds new required definitions to Chapter 2. The term code has been amended to make the code consistent with language used in other codes and standards. These changes also make the terms consistent with the IAPMO rules and regulations. Section Labeled refers to equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the Authority Having Jurisdiction and concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner. Analysis: This adds a new required definition to Chapter 2. The term code has been amended to make the code consistent with language used in other codes and standards. This change also makes the terms consistent with the IAPMO rules and regulations. Section New definitions for Shall, Should, Standard, and Stationary Fuel Cell Power Plant Shall indicates a mandatory requirement. Should indicates a recommendation or that which is advised but not required.

4 Standard is a document, the main text of which contains only mandatory provisions using the word "shall" to indicate requirements and which is in a form generally suitable for mandatory reference by another standard or code or for adoption into law. Nonmandatory provisions shall be located in and appendix, footnote, or fine-print note and are not to be considered a part of the requirements of a standard. Stationary Fuel Cell Power Plant is a self-contained package or factory-matched packages that constitute and automatically operated assembly of integrated systems for generating useful electrical energy an recoverable energy that is permanently connected and fixed in place. Analysis: This adds new required definitions to Chapter 2. The term code has been amended to make the code consistent with language used in other codes and standards. These changes also make the terms consistent with the IAPMO rules and regulations. Section Chapter 16, Part II Referenced Standards, provides guidance as to available nationally recognized standards. A list of accepted mechanical equipment and material standards is included in Chapter 17, Part II. Analysis: This change was made to reflect that Chapter 16 was moved to Chapter 17 and will make it consistent with the wording in Section of the Uniform Plumbing Code. Section Oil-Burning Appliances. The tank, piping, and valves for appliances burning oil shall be installed in accordance with the requirements of standards referenced in Chapter 16, Part II NFPA 31, Standard for the Installation of Oil-Burning Equipment. Analysis: This section was formerly Section in the previous version of this code and has been moved and renumbered as Section The change in wording is to correlate the UMC and NFPA 31, Standard for the Installation of Oil Burning Equipment. The reference to NFPA 31 already exists in Chapter 17, Part II; this makes the source of the requirement easier for the user to identify. Section Type of Fuel and Fuel Connections Connecting Gas Equipment. Deleted existing Section language and replaced the section with text from NFPA 54, National Fuel Gas Code, paragraphs through Analysis: This change was made to correlate the UMC and NFPA 54, National Fuel Gas Code.

5 Section LPG Appliances. Liquefied petroleum gas-burning appliances shall not be installed in a pit, basement or similar location where heavier-than-air gas might collect. Appliances so fueled shall not be installed in an above-grade under-floor space or basement unless such location is provided with an approved means for removal of unburned gas. Analysis: This section was deleted since there is no justification for this prohibition and NFPA has provided statistics in the past to demonstrate that incidents involving below grade propane incidents are not greater than those for natural gas. A similar prohibition does not exist in NFPA 54. Installations of LP-gas appliances are common in basements in cities and states that adopt NFPA 54. Section Appliances installed in garages, warehouses, or other areas where they may be subjected to mechanical damage shall be suitably guarded against such damage by being installed behind protected barriers or by being elevated or located out of the normal path of vehicles. Analysis: This change was made to make the code consistent with language used in other codes and standards. This change also makes the term consistent with the IAPMO rules and regulations. Table 3-1, Note A central heating boiler or furnace shall be installed in accordance with the manufacturer s instructions and shall be installed on a floor of noncombustible construction with noncombustible flooring and surface finish an with no combustible material against the underside thereof, or on fire-resistive slabs or arches having no combustible material against the underside thereof. Exception No. 1: Appliances listed for installation on a combustible floor. Exception No. 2: Installation on a floor protected in an approved manner. [NFPA 54:9.3.3] Analysis: This language was extracted from NFPA 54 Section and was added as Note 11 to Table 3-1. This change was made to correlate the UMC and NFPA 54, National Fuel Gas Code. Section Ventilation (outdoor) air for occupants shall be designed in accordance with ANSI/ASHRAE Analysis: A reference to ANSI /ASHRAE has been added. This is the standard for outdoor ventilation requirements.

6 Chapter 5 This Chapter has been extensively changed to make it consistent with the language used in NFPA 96 Standard for Commercial Kitchen Equipment. Some of these provisions have been extracted in their entirety. Also, there are new drawings from NFPA 96 for duct joints and Table 5-5 and 5-6 were previously in Chapter 6 in the 2000 UMC. Section New definitions for: Access Panel Easily Accessible Liquidtight Air Intakes Factory-Built Grease Enclosures Listed Air Pollution Control Devices Field-Applied Grease Duct Enclosures Noncombustible Material Appurtenance Fire Barrier Wall Open Combustible Construction Automatic Fire Partition Pitched Baffle Plate Fire Resistance Rating Recirculating Systems Classified Fume Incinerators Removable Clearly Identified Fusible Link Replacement Air Closed Combustible Construction Grease Salamander Boiler Combustible Material Grease Ducts Shall Commercial Food Heat-Processing Equipment Grease Filters Single Hazard Area Compensating Hood Grease Filter, Mesh Type Solid Cooking Fuel Concealed Spaces Grease Removal Devices Solid-Fuel Cooking Equipment Continuous Enclosure Greasetight Solvent Continuous Weld High Boiler Spark Arrestor Cooking Appliance Flue Outlet High Limit Control Standard Damper Hood Termination Detection Devices Interconnected Thermal Recovery Unit Dips Labeled Trap Discharge Limited-Combustible Material Upright Boiler Analysis: New definitions from NFPA 96 have been added to aid the user to better understand the code. Section Ducts for domestic range hoods shall only serve cooking appliances. Analysis: This sentence was inserted because there is currently no provision to prohibit an environmental air fan, a domestic range hood, and a clothes dryer from sharing the same exhaust duct. Section Clothes dryer moisture-exhaust ducts shall not be connected to a gas vent connector, gas vent or chimney, and shall serve no other appliance or exhaust system.

7 Analysis: This sentence was inserted because there is currently no provision to prohibit an environmental air fan, a domestic range hood, and a clothes dryer from sharing the same exhaust duct. Section Exception: Approved flexible duct connectors Listed clothes dryer transition ducts not more than six (6) feet (1829 mm) in length may be used in connection with domestic dryer exhausts. Flexible clothes dryer transition ducts connectors shall not be concealed with construction. Analysis: There are clothes dryer transition ducts specifically listed for this purpose. These ducts are either rigid or flexible. UL Subject 2158A, Outline of Investigation for Clothes Dryer Transition Duct, is used for investigating and listing these ducts. Section Incompatible materials shall not be conveyed in the same system. Analysis: This change is to correlate the UMC and NFPA 91, Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids. Section In systems conveying flammable vapors, gases, or mists, the concentration shall not exceed 25 percent of the lower flammability limit (LFL). Exception: Higher concentrations shall be permitted if the exhaust system is designed and protected in accordance with the Standard on Explosion Prevention Systems in Chapter 17, using one or more of the following techniques: (a) Combustible concentration reduction (b) Oxidant concentration reduction (c) Deflagration suppression (d) Deflagration pressure containment Analysis: This change is to correlate the UMC and NFPA 91, Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids. Section (1) Class 1 product-conveying ducts that operate at less than four (4) inches water column (995.6 Pa) negative pressure and convey noncorrosive, nonflammbale, and nonexplosive

8 materials at temperatures not exceeding 250 F (121 C) may 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 6-2. Analysis: With the changes occurring in Chapter 6, previously referenced tables were renumbered and additional tables were added. This change is to reflect that the correct tables are referenced in Exception 1 for Product-Conveying Ducts. Section If a room or building contains a dust explosion hazard that is external to protected equipment, as defined in of NFPA 654, such areas shall be provided with deflagration venting to a safe outside location. Analysis: This change is to correlate the UMC and NFPA 654, Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids. Section Under Section 506.5, new sub-sections, through , were inserted containing language that was extracted from NFPA 91, paragraphs through Analysis: This change is to correlate the UMC and NFPA 91, Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids. Section Duct Clearances. Deleted existing text for Section and replaced with the following language that was extracted from NFPA 91, paragraphs through along with any tables or figures that are referenced within those sections. Analysis: This change is to correlate the UMC and NFPA 91, Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids. Part II Commercial Hoods and Kitchen Ventilation Section through The new language that was inserted in these sections has been extracted from NFPA 96. The following are the main topics that are discussed: Section General Requirements, Clearances and Alternative Methods

9 Section Hood Construction, Exhaust Hood Assemblies with Integrated Supply-Air Plenums, Listed Hood Assemblies, and Solid-Fuel Assemblies Section Grease Removal Devices in Hoods, Installation and Solid-Fuel Grease Removal Devices Section Exhaust Duct Systems, General Requirements, Non-Grease Ducts, Clearance, Openings, Listed Grease Ducts, Materials and Installation for Other Grease Ducts, Exterior Installations, Interior Installation, Termination of Exhaust System, Rooftop Terminations, Wall Terminations, and Solid- Fuel Systems Section Air Movement, In-Line Exhaust Fans, Airflow, Replacement Air, Common Duct (Manifold) Systems, and Solid-Fuel Air Movement Requirements Section Auxiliary Equipment, Dampers, Electrical Equipment, Other Equipment, and Solid-Fuel Auxiliary Equipment Section Fire Extinguishing Equipment, General Requirements, Types of Equipment, Simultaneous Operation, Fuel Shutoff, Manual Activation, System Annunciation, System Supervision, Special Design and Application, Review and Certification, Portable Fire Extinguishers, and Solid-Fuel Fire Extinguishing Equipment Section Procedures for the Use and Maintenance of Equipment, Operating Procedures, Inspection, Cleaning, and Operation, Maintenance, and Inspection of Solid Fuel Cooking Equipment Section Minimum Safety Requirements for Cooking Equipment, Cooking Equipment Approval, Installation, and Operating Controls Section Recirculating Systems, General Requirements, Design Restrictions, Interlocks, Location and Application Restrictions, Additional Fire Safety Requirements, and Use and Maintenance Section Solid-Fuel Cooking Operations, Venting Application, Location of Appliances, Hoods for Solid-Fuel Cooking, Exhaust Systems for Solid-Fuel Cooking, Grease Removal Devices for Solid-Fuel Cooking, Air Movement for Solid-Fuel Cooking, Fire-Extinguishing Equipment for Solid-Fuel Cooking, and Other Safety Requirements Analysis: This change is to correlate the UMC and NFPA 96, Standard for Ventilation Control and Fire Protection for Commercial Cooking Operations. NFPA 96 is nationally recognized and an applied standard. By including a reference to NFPA 96 within the UMC, the result is a complete operational and fire protection package for commercial cooking operations. The sections retained in the UMC are those not specifically addressed in NFPA 96. Sections that were deleted from the UMC are those specifically addressed in NFPA 96 in greater detail. Section General. Supply air, return air, and outside air for heating, cooling, or evaporative cooling systems shall be conducted through duct systems constructed of metal as set forth in Tables 6-1, 6-2, 6-3, 6-4, 6-7, 6-8, 6-9, and 6-10, or metal ducts complying with UMC

10 Standard No. 6-2 or the referenced HVAC duct construction standard in Chapter 17, Part II with prior approval. Rectangular ducts in excess of 2 inches w.g. shall comply with UMC Standard No. 6-2 or the referenced HVAC duct construction standard in Chapter 17, Part II. Analysis: Additional tables were inserted into Chapter 6. This section was updated to include references to the SMACNA tables and the requirements currently used in modern rectangular duct construction up to 2-inch water gauge static pressure. Section Combustibles within Ducts or Plenums. Materials exposed within ducts or plenums shall have a flame-spread index of not more than 25 and a smoke-developed rating index of not more than 50 when tested in accordance with the test for surface burning characteristics of building materials. (See the building code standards based on ASTM E84-91a and ANSIUL ) as a composite product in accordance with ASTM E84 or ANSI/UL 723, Standard for Test for Surface Burning Characteristics of Building Materials, or as a composite product in accordance with NFPA 255 Standard Method of Test of Surface Burning Characteristics of Building Materials, ASTM E or ANSI Analysis: This revision is a clarification for an existing requirement and to address the references to ASTM E 84, ANSI/UL 723, and NFPA 255. Section (1) Return-air and outside-air ducts, plenums or concealed spaces which that serve a dwelling unit may be shall be permitted to be of combustible construction. Analysis: Editorial change for clarification purposes. Section (5) Electrical wiring in plenums shall comply with the NFPA 70, National Electrical Code. Analysis: Clarifies that the Electrical Code is NFPA 70, National Electrical Code since the International Electrical Code exists as well. Section (5)(b) Produce smoke having an average optical density not greater than 0.15 and having a peak optical density of 0.5 or less when tested in accordance with UMC Standard No. 6-3 NFPA

11 262, Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces. Analysis: UMC Standard No. 6-3 has been removed from the 2003 UMC. NFPA 262 is the replacement standard since cables and sprinkler pipe are referenced. Section (6)(b) Produce smoke having an average optical density not greater than 0.15 and having a peak optical density of 0.5 or less when tested in accordance with UMC Standard No. 6-3 UL 1887, Standard for Fire Test of Plastic Sprinkler Pipe for Flame and Smoke Characteristics. Analysis: UMC Standard No. 6-3 has been removed from the 2003 UMC. UL 1887 is the replacement standard since nonmetallic sprinkler pipe in plenums are referenced. Section (7)(8)(9) (7) Nonmetallic pneumatic tubing in plenums shall be listed and shall meet the following requirements: (a) Exhibit flame travel of five (5) feet (1524 mm) or less, and (b) Produce smoke having an average optical density not greater than 0.15 and having a peak optical density of 0.5 or less when tested in accordance with UL 1820, Standard for Fire Test of Pneumatic Tubing for Flame and Smoke Characteristics. (8) Loudspeakers and recessed luminaries including their assembles and accessories in plenums shall be listed and shall meet the following requirements: (a) Have a peak rate of heat release not greater than 100 kilowatts. (b) Produce smoke having an average optical density not greater than 0.15 and having a peak optical density of 0.5 or less when tested in accordance with UL 2043, Standard for Fire Test for Heat and Visible Smoke Release of Discrete Products and Their Accessories Installed in Air-Handling Spaces. (9) Smoke detectors. Analysis: These exceptions were inserted into Section since they are allowed in NFPA 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems. Section Crimp joints for residential round ducts shall have a contact lap of at least 1-1/2 inch (38 mm) and shall be mechanically fastened by means of at least three sheet-metal screws equally spaced around the joint, or an equivalent fastening method.

12 Joints and seams and all reinforcements for factory-made air ducts and plenums shall meet with the conditions of prior approval in accordance with the installation instructions that shall accompany the products. Closure systems for rigid Class 1 air ducts and plenums shall be listed in accordance with UL 181A, Ducts and Air Connectors. and flexible Class 1 Flexible air ducts shall conform to the referenced standards for air ducts in closure systems in Chapter 16, Part II be listed in accordance with UL 181B, Standard for Closure Systems for Use with Flexible Air Ducts and Air Connectors. Analysis: Residential was deleted since crimp joints are also used in commercial and industrial applications. With the referencing of UL 181A and 181B, Class 1 was removed because UL 181 requires both Class 0 and 1 air ducts to be installed in closure systems. Section Metal. Every duct, plenum, or fitting of metal shall comply with Table 6-1 or Exceptions: (1) Ducts, plenums, and fittings for systems serving single-dwelling units may comply with Table (2) Duct systems complying with UMC Standard or the referenced HVAC duct construction standard in Chapter 17, Part II with prior approval or duct systems complying with UL 181, Standard for Factory-Made Air Ducts and Air Connectors. Analysis: Besides minor editorial changes to reference the correct tables within Chapter 6 in Exception (1), in Exception (2), the reference to UMC Standard No. 6-1 was changed because No. 6-1 is no longer part of the 2003 UMC and was replaced by UL 181. Section Tin. Existing tin ducts may be used when cooling coils are added to a heating system, provided the first ten (10) feet (3048 mm) of the duct or plenum measured form the cooling coil discharge are constructed of metal of the gage thickness set forth in Tables 6-1, , or of this chapter or are of approved material and construction. Tin ducts completely enclosed in inaccessible concealed areas need not be replaced. All accessible ducts shall be insulated to comply with Table of this chapter. Analysis: Minor editorial changes to reference the correct tables within Chapter 6. Section Metal Ducts. Ducts shall be securely fastened in place at each change of direction and as set forth in Table Vertical rectangular ducts and vertical round ducts shall be

13 supported as set forth in Table , Part I A. Riser ducts shall be held in place by means of metal straps or angles and channels to secure the riser to the structure. Analysis: Minor editorial changes to reference the correct tables within Chapter 6. Section Factory-Made Air Ducts. Approved Listed Class 0 or Class 1 factory-made air ducts may be installed in any occupancy covered by this code. Analysis: Listed Class 0 and Class 1 factory-made air ducts are readily available in the industry: such ducts need to be listed to demonstrate compliance with Section Section Insulation of Ducts. Supply- and return-air ducts and plenums of a heating or cooling system shall be insulated to achieve the minimum thermal (R) value as set forth in Tables 6-4, except for ducts and plenums used exclusively for evaporative cooling systems 6-6A and B. Exceptions: (A) Factory-installed plenums, casings, or ductwork furnished as a part of HVAC equipment tested and rated in accordance with approved energy efficiency standards. (B) Ducts or plenums located in conditioned spaces. (C) For runouts less than 10 feet (3 m) in length to air terminal or air outlets, the rated R value of insulation need not exceed R-3.5 (R-0.6). (D) Backs of air outlets and outlet plenums exposed to unconditioned or indirectly conditioned spaces with face areas exceeding 5 sq. ft. (0.5 m 2 ) need not exceed R-2 (R- 0.4); those 5 sq. ft. (0.5 m 2 ) or smaller need not be insulated. (E) Ducts and plenums used exclusively for evaporative cooling system. Analysis: These revisions make the tables 6-6A and B easier to use by directly stating the insulation R-value required for a given application without having to read the table footnotes. The R-value selections are consistent with both ASHRAE 90.1 and International Energy Conservation Code. Section Insulation applied to the exterior surface of ducts, including duct coverings and linings, located in buildings shall have, when tested as a composite installation in the form in which they are used, a maximum flame spread index of not more than 25 and a maximum smokedensity not exceeding developed index of 50 when tested as a composite installation including insulation, facing materials, tapes and adhesives as normally applied in accordance with NFPA , Standard Method of Test of Surface Burning

14 Characteristics of Building Materials or in accordance with ASTM E a, Standard Test Method for Surface Burning Characteristics of Building Materials or in the provisions of UL , Standard for Test of Surface Burning Characteristics of Building Materials. Where these products are to be applied with adhesives, they shall be tested with such adhesives applied. Air duct coverings and lining shall not flame, glow, smolder, or smoke when tested in accordance with ASTM C411-97, Standard Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation, at the temperature to which they are exposed in service. In no case shall the test temperature be below 250 F (121 C). Factory-made air ducts and faced insulations intended for installation on the exterior of ducts shall be legibly printed with the name of the manufacturer, the thermal resistance (R) value at installed thickness and the flame-spread index and smoke-developed rating index of the composite material. Analysis: The modified language reinstates testing of duct coverings and lining as a composite installation and eliminates referencing panels and plenums to avoid any potential confusion. The terminology adopted by ASTM committee E5 on Fire Standards is now clear in that the terms recommended to be used are flame spread index and smoke developed index. Section Ductwork shall be connected to damper sleeves or assemblies in such a way that collapse of the ductwork will not dislodge the damper or impair its proper operation accordance with the fire damper manufacturer s installation instructions. Analysis: Due to the many types of fire dampers that are now available, this change assures that the methods for connecting ductwork to each manufacturer s fire damper will be addressed accordingly and allow for proper operation of the damper and enhanced safety to the building occupants. Section Ceiling Radiation Dampers. Ceiling radiation dampers shall comply with the standard for ceiling radiation dampers referenced in Chapter 16 17, Part II, and shall be installed in accordance with manufacturer s approved installation instructions in the fire-resistive ceiling element of floor-ceiling and roof-ceiling assemblies when required by the Building Code. Fire dampers not meeting the temperature limitation of ceiling dampers shall not be used as a substitute. Ceiling radiation dampers shall be labeled by an approved agency. Analysis: The term radiation was inserted throughout the section to be consistent in the terminology of ceiling radiation dampers.

15 Section Use of Under-Floor Space as Supply Plenum for Dwelling Units. Analysis: Additional language was inserted into the title for clarification that the requirements of this section only deal with residential occupancies. Section The entire ground surface of the under-floor space shall be covered with a vapor barrier having a minimum thickness of four (4) mils ( mm) and a flame spread rating index of 200 or less. Analysis: The terminology adopted by ASTM committee E5 on Fire Standards is now clear in that the term recommended to be used is flame spread index. Section (5) Smoke detectors that are factory installed in listed air-moving equipment may be used in lieu of smoke detectors installed in the main supply-air duct served by such equipment. Analysis: This additional exception in Section would allow factory installed smoke detectors in the unit instead of the SA duct. Section All language in Section regarding Product-Conveying Ducts, has been removed from Chapter 6 in the 2003 UMC. Analysis: The exact same language is addressed in Section of Chapter 5 in the 2003 UMC. Tables 6-1, 6-2, 6-6A, and 6-6B Additional of dealing with duct construction for 4 and 5 foot duct lengths and minimum duct insulation R-values were inserted into Chapter 6 of the 2003 UMC. Analysis: Table 6-1 from the 2000 UMC has been replaced with the new SMACNA tables (6-1 and 6-2) since they contain the requirements currently used in modern rectangular duct construction up to 2-inch water gauge static pressure. The R-value tables were inserted for consistency with ASHRAE 90.1 and the International Energy Conservation Code.

16 Chapter 7 Table 7-1 and all previous language except Section in Chapter 7 of the UMC 2000 has been revised and replaced by extracted language and figures from NFPA 54, Sections 8.3 and A8.3. The following are the main topics that are discussed: Section General Requirements for Combustion and Ventilation Air Section Indoor Combustion Air Section Indoor Opening Size and Location Section Outdoor Combustion Air Section Combination Indoor and Outdoor Combustion Air Section Engineered Installations Section Mechanical Combustion Air Supply Section Mechanical Combustion Air Requirements Section Louvers and Grilles Section Combustion Air Ducts Section Dampers Prohibited (formerly numbered in 2000 UMC) Analysis: This change is to correlate the UMC and NFPA 54, National Fuel Gas Code. NFPA 54 is nationally recognized and an applied standard. By including a reference to NFPA 54 within the UMC, the result is to ease comparison of the two documents. Chapter 8 All previous language has been deleted and replaced with new language, figures and tables that have been extracted from NFPA 54, Chapters 10 and 13. Some tables were also moved from the 2000 UMC Appendix C into Chapter 8. The following are the main topics that are discussed: Section The Scope for Venting of Fuel Appliances Section General Requirements for Vents Section Specifications for Venting Section Design and Construction Section Type of Venting System to Be Used Section Masonry, Metal, and Factory-Built Chimneys Section Gas Vents Section Single-Wall Metal Pipe Section Through-the-Wall Vent Termination Section Condensation Drain Section Vent Connectors for Category I Gas Utilization Equipment Section Vent Connectors for Category II, Category III, and Category IV Gas Utilization Equipment Section Draft Hoods and Draft Controls Section Manually Operated Dampers Section Automatically Operated Vent Dampers

17 Section Obstructions Section Sizing of Category I Venting Systems Section Additional Requirements to Multiple Appliance Vent Analysis: This change is to correlate the UMC and NFPA 54, National Fuel Gas Code. NFPA 54 is nationally recognized and an applied standard. By including a reference to NFPA 54 within the UMC, the result is to ease comparison of the two documents. Chapter 9 Some sections from this chapter have been deleted and replaced with new language, figures and tables that have been extracted from NFPA 54, Chapter 9. The following are the main topics that are discussed: Section General Requirements Section Air-Conditioning Equipment (Gas-Fired Air Conditioners and Heat Pumps) Section Central Heating Boilers and Furnaces Section Equipment on Roof Section Clothes Dryers Section Conversion Burners Section Decorative Appliances for Installation in Vented Fireplaces Section Gas Fireplaces, Vented Section Non-Recirculating Direct Gas-Fired Industrial Air Heaters Section Recirculating Direct Gas-Fired Industrial Air Heaters Section Duct Furnaces Section Floor Furnaces Section Food Service Equipment, Floor Mounted Section Food Service Equipment, Counter Appliances Section Hot Plates and Laundry Stoves Section Household Cooking Appliance Section Illuminating Appliances Section Incinerators, Commercial-Industrial Section Infrared Heaters Section Open-Top Broiler Units (formerly numbered in 2000 UMC) Section Outdoor Cooking Appliances Section Pool Heaters Section Refrigerators Section Room Heaters (formerly numbered in 2000 UMC) Section Stationary Gas Engines Section Gas-Fired Toilets Section Unit Heaters Section Wall Furnaces Section Appliances for Installation in Manufactured Section Small Ceramic Kilns (formerly numbered in 2000 UMC)

18 Analysis: This change is to correlate the UMC and NFPA 54, National Fuel Gas Code. NFPA 54 is nationally recognized and an applied standard. By including a reference to NFPA 54 within the UMC, the result is to ease comparison of the two documents. Chapter Fuel Piping, Tanks, and Valves. Fuel piping shall conform to Chapter 16 Part II, Referenced Standards - Tanks, piping, and valves for oil-burning appliances, Chapter 2 and 3 of shall be installed in accordance with NFPA , Standard for the Installation of Oil-Burning Equipment. Analysis: This change is to correlate the UMC and NFPA 31, Standard for Installation of Oil-Burning Equipment. Section Human Comfort. Cooling systems used for human comfort shall comply with the return-air and outside-air provisions for furnaces in Section and of this code. Cooling equipment used for human comfort in dwelling units shall be sized to satisfy the calculated loads determined in accordance with the reference standards in Chapter 17, Part II or other approved methods. Analysis: The existing text in Section was retained because it provides guidance on return air and outside air for cooling systems. The new requirements were limited to residential. Section (4) Cooling or refrigeration equipment, using Group A1 and B1 refrigerants or brine, located on a roof or on an exterior wall of a building may be provided access as for furnaces in Section of this code. Analysis: With all the new language that was changed in Chapter 9, this change is to reflect the correct referenced section for equipment on roofs. Section Exceptions: 1. Systems containing less than thirty-five (35) pounds (16 kg) of refrigerant R-717 and located in an approved exterior location. 2. Direct and indirect-fired lithium bromide absorption systems using water as the refrigerant.

19 Refrigeration machinery rooms shall house all refrigerant-containing portions of the system other than the piping and evaporators permitted by Section , discharge piping required of this chapter, and cooling towers regulated by this chapter, Part II, and their essential piping. Analysis: The 1997 UMC included provisions that required a machinery room for equipment with refrigerants other than A1. Since Section requires a machinery room for A1 refrigerants, when equipment exceeds 100 HP, it is important to require protection for equipment containing refrigerants other than A1, as they are either toxic, flammable or both. The deleted language has been moved to Section in the 2003 UMC. Section The system contains other than a Group A1 refrigerant. Exceptions: (1) Lithium bromide absorption systems using water as the refrigerant. (2) Ammonia-water absorption unit systems installed outdoors, provided that the quantity of refrigerant in a single system does not exceed Table 11-1 amounts and the discharge is shielded and dispersed. (3) Systems containing less than 300 pounds (136kg) of refrigerant R-123 and located in an approved exterior location. (4) Systems containing less than 35 pounds (16 kg) of refrigerant R-717 and located in an approved exterior location. Refrigeration machinery rooms shall house all refrigerant-containing portions of the system other than the piping and evaporators permitted by Section , discharge piping required of this chapter, and cooling towers regulated by this chapter, Part II, and their essential piping. Analysis: The 1997 UMC included provisions that required a machinery room for equipment with refrigerants other than A1. Since Section requires a machinery room for A1 refrigerants, when equipment exceeds 100 HP, it is more important to require protection for equipment containing refrigerants other than A1, as they are either more toxic, more flammable or both. Exception (4) and the proceeding paragraph came from Section in the 2000 UMC Section Ferrous Materials. Iron and steel refrigeration piping, valves, fittings and related parts shall be approved for the intended use. Pipe more than two (2) inches (50 mm) iron pipe size shall be electric-resistance welded or seamless pipe. (See UMC Standard 11-3 in Appendix A.) Analysis: UMC Standard No has been removed from the 2003 UMC. This was an outdated transcribed standard and was replaced by current standards referenced to make and keep the UMC current.

20 Section Identification. Piping shall be meet the reference standard for identified in accordance with UMC Standard No The type of refrigerant, function and pressure shall be indicated. Analysis: UMC Standard No has been removed from the 2003 UMC. This was an outdated transcribed standard and was replaced by current standards referenced to make and keep the UMC current. Section Stop valves shall be identified by tagging in accordance with UMC Standard No the referenced standard for identification. A valve chart shall be mounted under glass at an approved location near the principal entrance to a refrigeration machinery room. Analysis: UMC Standard No has been removed from the 2003 UMC. This was an outdated transcribed standard and was replaced by current standards referenced to make and keep the UMC current. Table 11-1 Additional refrigerant data was inserted into Table This data was reprint with the permission from the American Society of Heating, Refrigerant, and Air-Conditioning Engineering. Analysis: Updated Table 11-1 to the current ASHRAE standard. Section Insulation. Covering and insulation used for hot water pipes shall be of material suitable for the operating temperature of the system. The insulation, jackets, and lap-seal adhesives, including pipe coverings and linings, shall be tested as a composite product installation and shall have a flame-spread index of not more than 25 and a smokedeveloped rating index of not more than 50 when tested in accordance with building code standards NFPA , Standard Method of Test of Surface Burning Characteristics of Building Materials; in accordance with ASTM E a, Standard Test Method for Surface Burning Characteristics of Building Materials; or in accordance with the provisions of UL , Standard for test of Surface Burning Characteristics of Building Materials. Insulation coverings and linings shall not flame, glow, smolder, or smoke when tested in accordance with ASTM C , Standard Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation, at the temperature to which they are exposed in service. In no case shall the test temperature be below 250 F (121 C).

21 Analysis: These changes are consistent with proposals made to NFPA 90A and to the IMC, and with changes to Section and in the UMC. This revision is a clarification for an existing requirement and to address the references to ASTM E 84, ANSI/UL 723, ASTM C 411 and NFPA 255. The terminology adopted by ASTM committee E5 on Fire Standards is now clear in that the terms recommended to be used are flame spread index and smoke developed index. Section Those portions of the hot water piping systems in which the continuous pressure temperature relationship does not exceed the following shall be permitted to be constructed of cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) piping conforming to specification ASTM F1281. Additional PEX-AL-PEX requirements are mentioned within sub-sections of Refer to 2003 UMC for detail of these requirements. Analysis: Requirements for PEX-AL-PEX were inserted into Chapter 12. This material has been demonstrated to be suitable for the application mentioned. Chapter 13 All previous language has been deleted and replaced with new language, figures and tables that have been extracted from Chapters 1, 5, 6, 7, 8, and 12 in NFPA 54, Appendix B in the 2000 UMC, and sections in NFPA 501A. The following are the main topics that are discussed: Part I Fuel Piping Appliance Fuel Connector Fuel Gas Gas Piping Inspection of gas piping Certification of Inspection Authority to Render Gas Service Authority to Disconnect Temporary Use of Gas Gas Piping System Design, Materials, and Components Interconnections Between Gas Piping Systems Sizing of Gas Piping Systems Acceptable Piping Materials and Joining Methods Gas Meters Gas Pressure Regulators Venting of Gas Appliance Pressure Regulators Gas Piping Installation Installation of Piping

22 Concealed Piping in Building Drips and Sediment Traps Outlets Fittings and Piping Manual Gas Shutoff Valves Systems Containing Gas-Air Mixtures Outside the Flammable Range Systems Containing Flammable Gas-Air Mixtures Electrical Bonding and Grounding Pipe Sizing Methods Equipment Connections to Building Piping LP-Gas Facilities and Piping Pressure Testing and Inspection Part II Fuel Supply: Manufactured/Mobile Home Parks and Recreational Vehicle Parks Single and Multiple Manufactured Homesite Fuel Supply Systems Manufactured Home Community LP-Gas Supply Systems Manufactured Home Accessory Building Fuel Supply Systems Community Building Fuel Supply Systems in Manufactured Home Communities Recreational Vehicle Park Fuel Gas Equipment and Installations Analysis: This change is to correlate the UMC and NFPA 54, National Fuel Gas Code. NFPA 54 is nationally recognized and an applied standard. By including a reference to NFPA 54 within the UMC, the result is to ease comparison of the two documents. These are three important areas that changed: Fuel gas piping systems are limited to 5 psi, the specific prohibition against liquefied petroleum appliances in a pit or basement was removed, and CSST fuel piping systems were added to the code. Chapter 14 No change Chapter 15 No change Section Scope. Stationary fuel cell power plants shall be tested in accordance with ANSI Z21.83, American National Standard/Canadian Gas Association Standard for Fuel Cell Power Plants, and shall be installed in accordance with NFPA 853, Standard for the Installation of Stationary Fuel Cell Power Plants and the manufacturer s installation instructions. Analysis: This is a new chapter, which references ANSI Z (Standard for Fuel Cell Power Plants)

23 Chapter 17 Chapter 16 of the 2000 UMC has been moved to Chapter 17 in the 2003 UMC. In Part I, only UMC Standards No. 2-2, 6-2, and 6-5 have been retained. The remaining standards were deleted. In Part II, the standards are listed by product category and promulgating agency. Analysis: The format of the standards was completely redone by the Standards Task Group to be more user friendly. Appendix A, Standard No. 6-2 See Section 506.2, 602.1, and of the Uniform Mechanical Code Analysis: Two additional sections reference Standard No. 6-2 in the 2003 UMC. Appendix B All language from Appendix B, Chapter 15 has been deleted and replaced with extracted language from NFPA 54, Chapter 11. Analysis: This change is to correlate the UMC and NFPA 54, National Fuel Gas Code. NFPA 54 is nationally recognized and an applied standard. By including a reference to NFPA 54 within the UMC, the result is to ease comparison of the two documents. Appendix C All language from Appendix C has been moved into the body of code in the 2003 version. Chapter 16 in Appendix B of the 2000 UMC has been moved into Appendix C of the 2003 UMC. Analysis: Reformatting of the 2003 UMC to be more user friendly.