Chimney Top Devices in International Codes FINAL REPORT TECHNICAL NOTES. PREPARED BY: Pegah Farshadmanesh, Mehdi Modares, and Jamshid Mohammadi

Transcription

1 Chimney Top Devices in International Codes FINAL REPORT TECHNICAL NOTES PREPARED BY: Pegah Farshadmanesh, Mehdi Modares, and Jamshid Mohammadi Department of Civil, Architectural, and Environmental Engineering Illinois Institute of Technology Chicago, IL December 2015 Fire Protection Research Foundation FIRE PROTECTION RESEARCH FOUNDATION ONE BATTERMARCH PARK QUINCY, MASSACHUSETTS, USA WEB:

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3 FOREWORD Chimney top devices are used throughout the world and to provide clearer guidance, the NFPA 211 Technical Committee would like to develop a clearer vision of the international use of chimney top devices. A Fire Protection Research Foundation report entitled, Impact of Chimney-top Appurtenances on Flue Gas Flow, was previously completed in December 2014 included a look at existing chimney-top devices and their effect on the flow of gas. It also included a review of available chimney-top devices. However, it did not consider international implications. This project reviewed international codes and standards as they pertain to the use of chimney top devices. The purpose of the project, which is documented in this report, was to provide a review of the current requirements and the prescribed application of chimney top devices throughout international codes and standards for solid-fuel, oil-burning and gas-burning chimney/vent systems which includes fireplaces and heat producing appliances. The Fire Protection Research Foundation expresses gratitude to the report authors Pegah Farshadmanesh, Mehdi Modares, and Jamshid Mohammadi, who are with the Department of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology located in Chicago, IL. The Research Foundation appreciates the guidance provided by the Project Technical Panelists and all others that contributed to this research effort. Thanks are also expressed to the National Fire Protection Association (NFPA) for providing the project funding through the NFPA Annual Code Fund. The content, opinions and conclusions contained in this report are solely those of the authors and do not necessarily represent the views of the Fire Protection Research Foundation, NFPA, Technical Panel or Sponsors. The Foundation makes no guaranty or warranty as to the accuracy or completeness of any information published herein. About the Fire Protection Research Foundation The Fire Protection Research Foundation plans, manages, and communicates research on a broad range of fire safety issues in collaboration with scientists and laboratories around the world. The Foundation is an affiliate of NFPA. About the National Fire Protection Association (NFPA) Founded in 1896, NFPA is a global, nonprofit organization devoted to eliminating death, injury, property and economic loss due to fire, electrical and related hazards. The association delivers information and knowledge through more than 300 consensus codes and standards, research, training, education, outreach and advocacy; and by partnering with others who share an interest in furthering the NFPA mission. All NFPA codes and standards can be viewed online for free. NFPA's membership totals more than 65,000 individuals around the world. Keywords: Chimney top devices, Fuel, Gap identification, International Codes. Page ii

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5 PROJECT TECHNICAL PANEL Eric Nette, NFPA Dale Feb, FIRE Service Rick Curkeet, Intertek Testing Services Richard Peacock, NIST Nathan Wittasek, Exponent David Walters, HY-C Company LLC Tom Stroud, Hearth, Patio & Barbecue Association Steen Hagensen, Enervex Inc. PROJECT SPONSORS National Fire Protection Association Page iv

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7 Executive Summary Proper design of chimney top devices is essential to ensure the safety of residential and commercial buildings against fire. Those chimney top devices include exhaust terminations, rain caps, decorative shrouds, chimney top dampers and spark arrestors. However, information and provisions for such design is sporadic among existing International Codes. NFPA 211 is a major source of such information that is currently used for such design. Nevertheless, there exist gaps between the available information in International Codes and NFPA 211. This study is a comprehensive review of the current requirements and prescribed applications of chimney top devices throughout numerous international codes. The reviewed codes include International Building Code, International Residential Code, International Mechanical Code, International Fuel Gas Code, International Existing Building Code, and International Plumbing Code. The study pertains to solid-fuel, oil-burning and gas-burning chimney/vent systems including fireplaces and heat producing appliances. Through this study, the existing gaps between international codes and NFPA 211, as related to top devices and venting system, are identified and summarized. 1

8 Table of Contents SECTION A: INTRODUCTION AND BACKGROUND... 3 SECTION B: GAP IDENTIFICATION... 4 Table 1: Summary of gap identification comparing the International Building Code to NFPA Table 2: Summary of gap identification comparing the International Mechanical Code to NFPA Table 3: Summary of gap identification comparing the International Fuel Gas Code to NFPA Table 4: Summary of gap identification comparing the International Residential Code to NFPA Table 5: Summary of gap identification comparing the International Existing Building Code to NFPA SECTION C: SUMMARY AND CONCLUSIONS Table 6: Caps Table 7: Spark Arrestors Table 8: Dampers Table 9: Draft Devices Table 10: Decorative Shrouds Table 11: Openings Table 12: Exhaust Terminations Table 13: Flue and Vent Systems Table 14: General Information Table 15: Architectural features Table 16: Clearance References

9 SECTION A: INTRODUCTION AND BACKGROUND Chimneys are the primary means of safely venting combustion gases outside of an indoor environment. Therefore, it is important to fully understand all chimney components and their proper design and safety considerations. One of the most important factors in safe operation of chimneys is proper induced draft in the system, which is a function of combustion temperature, outdoor environment conditions, and flow resistance of the chimney assembly. A chimney top device is a component of a chimney providing the boundary between the flue gases inside the chimney and the outdoor environment. Improper design of the chimney top devices can cause blow back down the chimney, inhibit proper draft, or even allow noxious flue gases to re-enter the indoor environment. Chimney top devices include exhaust terminations, rain caps, decorative shrouds, chimney top dampers and spark arrestors. However, existing codes and standards on these devices can vary widely and may lead to confusion and poor designs. NFPA 211 is a source of information on chimney top devices. Nevertheless, there exist gaps between the available information in NFPA 211 and existing codes. Previous research in December 2014, entitled, Impact of Chimney-Top Appurtenances on Flue Gas Flow, reviewed studies and reports of research related the existing chimney top devices and their effect on flue gas flow. The main objective of this study is to have a comprehensive review of the current requirements and prescribed applications of chimney top devices in international codes. Codes reviewed include the International Building Code, International Residential Code, International Mechanical Code, International Fuel Gas Code, International Existing Building Code, and International Plumbing Code. The study pertains to solid-fuel, oilburning and gas-burning chimney/vent systems including fireplaces and heat-producing appliances. In this study, the existing gaps between international codes and NFPA 211, as relate to top devices and venting systems, are identified and summarized. 3

10 SECTION B: GAP IDENTIFICATION Table 1: Summary of gap identification comparing the International Building Code to NFPA 211 Device Current NFPA 211 Code Information(IBC) Architectural Features Determination of net pressure coefficients, C net. (Sec ) Cap 4.6.1, Chimney Cap Chimney caps (Sec ) Cap Rain caps (Sec ) Termination Table 7.2, FIGURES 4.2(a) Termination (Sec ) Spark arrestors Spark Arresters., Spark arrestors (Sec ) Flue and Vent System Flue and Vent System , , , No Information Clearance Clearance, , , Flue and Vent System 10.5 Notice of Usage Flue and Vent System Residential-Type and Building Heating Appliances., Flue and Vent System , Minimum area (Sec ) Determination of minimum area (Sec ) Framing around flues and chimneys (Sec ) Notice of usage (Sec ) Residential-type appliances (general). (Sec ) Flue area (appliance) (Sec ) Flue and Vent System Lining (Sec ) Termination Termination (Height), Table 7.2 Clearance Clearance, Table 7.2, , Termination Termination (Height), Table 7.2 Termination height (Sec ) Clearance (Sec ) Termination height (Sec ) Clearance Clearance (Sec ) 4

11 Table 2: Summary of gap identification comparing the International Mechanical Code to NFPA 211 Device Current NFPA 211 Code Information (IMC) Clearance Table , Masonry chimneys (Sec ) Draft Device Positive-Pressure Applications. Positive pressure (Sec ) Flue and Vent System Positive-Pressure Applications Positive flow (Sec ) Flue and Vent System Flue and Vent System Space Surrounding Liner or Vent , 14.9 Damaged or Deteriorated Liners. Space around lining (Sec ) Flue passageways (Sec ) Clearance Clearance., , , Clearances. (Sec ) Cap Vent termination caps required (Sec ) Termination FIGURE 4.2(a)(b) Type L vent terminations (Sec ) Flue and Vent System 4.2.2, , , Pellet Minimum vent heights Vent (Sec ) Flue and Vent System , Flue lining (Sec ) Flue and Vent System Flue Cross-Sectional Area. Solid fuel appliance flues (Sec ) Damper 9.9 Dampers Manual dampers (Sec ) Mechanical draft systems for (b) Draft Device manually fired appliances and fireplaces (Sec ) Damper Automatic dampers (Sec ) Draft Device 1.4 Forced/Induced Draft Systems. Forced draft systems (Sec ) Termination Termination (Sec ) Terminations Terminations Termination Terminations , FIGURE 4.2(a) , , Vent Cap, Direct Vent Appliances Fired with Gas, Oil, or Pellet Fuels. Mechanical draft systems (Sec ), Horizontal terminations. (Sec ) Mechanical draft systems (Sec ), Vertical terminations. (Sec ) Direct-vent terminations (Sec ) Terminal clearances (Sec ) Decorative Shroud Decorative Shrouds Decorative shrouds (Sec ) 5

12 Table 2: Summary of gap identification comparing the International Mechanical Code to NFPA 211 (Continued) Device Current NFPA 211 Code Information (IMC) Terminations Table7.2, , , Table Exhaust outlets (Sec ), TABLE Flue and Vent System 14.8 Operating Malfunction. Size (Sec ) General Information , Factory-Built, Residential-Type and Building Heating Appliance Type Chimney. Solid fuel appliances (Sec ) General Information Flue and Vent System Oil-fired appliances (Sec ) Residential-Type and Building Heating Appliances., Low-, Medium-, and High-Heat Appliances Residential and low-heat appliances (general) (Sec ) General Information Medium-heat appliances (Sec ) 6

13 Table 3: Summary of gap identification comparing the International Fuel Gas Code to NFPA 211 Device Current NFPA 211 Code Information(IFGC) Flue and vent system 5.3 Space Surrounding Liner or Vent., Combustion air ducts. (Sec ) Flue and vent system 14.8 Operating Malfunction. Size. (Sec ) Clearance Clearance., , , Clearances. (Sec ) Draft device , Mechanical Draft Systems, , Forced/Induced Draft Systems., Natural Draft Vent Connectors, (c) Mechanical draft systems (Sec ) Draft device (3) Positive pressure (Sec ) Terminations Draft device Decorative shrouds Flue and vent system , Terminations 8.2.1, Termination (Height), , 4.2.2, , Decorative Shrouds Engineered Venting or Chimney System FIGURE 4.2(a) Chimney termination (Sec ) Mechanical draft (Sec ) Decorative shrouds (Sec ) Minimum height (Sec ) Forced air inlets (Sec ) Terminations , FIGURE 4.2(a) Termination (Sec ) Terminations Roof Jack., Flue and vent system Sizing., Terminations Draft Device A (1) Damper 9.9.1, 9.9.2, Damper Roof terminations (Sec ) Size of single-wall metal pipe (Sec ) Termination capacity (Sec ) Additional devices (Sec ) Manually operated dampers (Sec ) Automatically operated vent dampers (Sec ) Damper Obstructions (Sec ) Flue and vent system Vertical vent maximum size (Sec ) 7

14 Table 3: Summary of gap identification comparing the International Fuel Gas Code to NFPA 211(Continued) Device Current NFPA 211 Code Information(IFGC) Flue and vent system Space Surrounding Liner or Vent., , Space surrounding lining or vent (Sec ) Flue and vent system A General (Sec ) Flue and vent system , , Terminations General Info , FIGURE 4.2(a) Clearance Table Opening 9.8.3, Residential-Type and Building Heating Appliances, Low-, Medium-, and High- Heat Appliances. Gas vents installed within masonry chimneys (Sec ) Gas vent terminations (Sec ) Residential and low-heat appliances flue lining systems (Sec ) Reduction table (Sec ), TABLE Liquid fuel-burning appliances (Sec ) General Info Incinerators (Sec ) Flue and vent system General Info General Info Flue and vent system General Factory-Built, Positive Pressure Capable Chimney Listed or Approved Materials., A Engineered Venting or Chimney System. Special gas vent (Sec ) Factory-built chimneys (Sec ) Masonry chimneys (Sec ) Engineering calculations (Sec ) Flue and vent system No Information Height entries (Sec ) Flue and vent system No Information Vent height measurement (Sec ) Flue and vent system No Information Minimum size (Sec ) Flue and vent system Flue and vent system No Information No Information Chimney and vent locations (Sec ) Chimney and vent location (Sec ) Damper No Information Free opening area of chimney dampers (Sec ) 8

15 Table 4: Summary of gap identification comparing the International Residential Code to NFPA 211 Device Current NFPA 211 Code Information(IRC) Flashing , FIGURE A.11.2(a) FIGURE A.11.2(b) Other flashing (Sec. R ) Crickets No Information Crickets and saddles (Sec. R ) Multiple Flues, , Multiple flues (Sec. R ) Damper Dampers , Damper (Sec. R ) Flue and vent system Flue and vent system , , , , Change in Size or Shape of Flue at Combustible Members Flue area (masonry fireplace) (Sec. R ), R Option 1. (Sec. R ) Option 2. Changes in dimension (Sec. R1003.6) Termination Termination (Sec. R1003.9) Cap Chimney Cap, Chimney caps (Sec. R ) Flue and vent system , Flue lining (material) (Sec. R ) Flue and vent system Flue and vent system Residential-Type and Building Heating Appliances Low-, Medium-, and High-Heat Appliances Space Surrounding Liner or Vent. Residential-type appliances (general) (Sec. R ) Space around lining (Sec. R ) Decorative shroud , Decorative Shrouds. Decorative shrouds (Sec. R1004.3) General Information General. Listing (Sec. R1005.1) Decorative shroud Decorative Shrouds, Decorative shrouds (Sec. R1005.2) Draft Device , Chimney Flue. Draft requirements (Sec. M1801.2) Flue and vent system A.9.11, Size (Sec. M ) Clearance Clearance, , , Clearances (Sec. M ) Draft Device , Forced/Induced Draft Systems Mechanical draft systems. (Sec. M1801.5) Opening A Unused openings (Sec. M ) Damper 9.9.1, Manually operated (Sec. M ) Damper Automatically operated (Sec. M ) 9

16 Table 4: Summary of gap identification comparing the International Residential Code to NFPA 211 (Continued) Device Current NFPA 211 Code Information(IRC) Draft Device , A.9.11 Draft regulators (Sec. M1802.3) Flue and vent system Through the roof (Sec. M ) Decorative shroud Decorative Shrouds., Decorative shrouds (Sec. M ) Draft Device 4.2.2, , Natural draft appliances (Sec. M ) Flue and vent system , FIGURE 4.2(a), FIGURE 4.2(b) Type L vent (Sec. M ) Termination Draft Device , , Opening 9.4.2, Direct vent terminations (Sec. M ) Mechanical draft systems (Sec. M ) Size of single-appliance venting systems (Sec. M ) Flue and vent system Size of chimney flues (Sec. M1805.3) Clearance Clearance., , , Clearances (Sec. G ( )) Termination Draft Device Termination (Height), , 4.2.2, , Decorative Shrouds Engineered Venting or Chimney System Chimney termination (Sec. G ( )) Mechanical draft (Sec. G ( ) Opening General Information A Type HT Factory-Built, Residential-Type and/or Building Heating Appliance Type Chimney. Two or more openings (Sec. G ( )) Listing (Sec. G (506.1)) General Information , Solid-fuel appliances (Sec. R1005.3) 10

17 Table 4: Summary of gap identification comparing the International Residential Code to NFPA 211 (Continued) Device Current NFPA 211 Code Information(IRC) General Information Medium-heat appliances (Sec. R1005.6) Cap Rain caps (Sec. R ) Cricket No Information Chimney crickets (Sec. R ) Draft Device Damper 9.7.9, Damper No Information Additional devices (Sec. G ( )) Obstructions (Sec. G (503.15)) Free opening area of chimney dampers (Sec. G (634.1)) Spark arrestor Spark Arresters., Spark arrestors (Sec. R ) Flue and vent system Flue Cross-Sectional Area. Size of chimney flue for solid-fuel appliance (Sec. M ) Flue and vent system 9.8.3, Liquid fuel-burning appliances (Sec. G ( )) 11

18 Table 5: Summary of gap identification comparing the International Existing Building Code to NFPA 211 Device Current NFPA 211 Code Information(IEBC) Draft Device Mechanical draft systems for manually fired appliances and fireplaces (Sec ) No information related to chimney top-devices was identified in international Plumbing Code. 12

19 SECTION C: SUMMARY AND CONCLUSIONS The gaps between specified international codes and NFPA211 are categorized as follows: Gap Category Complete Gap: The section in the specified code was nowhere identified within NFPA211 : The section in the specified code was partially addressed within NFPA211 : There section in the specified code was completely addressed within NFPA211 The following tables depict the existence and level of gap between International Codes and NFPA 211 for each chimney top device item. Table 6: Caps Code Code Information Current NFPA211 Gap IBC Chimney caps (Sec ) Chimney Cap, Rain caps (Sec ) IMC Vent termination caps required (Sec ) Chimney caps (Sec. R ) Chimney Cap, IRC Rain caps (Sec. R ) Unused openings (Sec. M ) A Result There is a between International Code and NFPA 211 Table 7: Spark Arrestors Code Code Information Current NFPA211 Gap Spark Arresters, Sec Discrepancies IBC Spark arrestors (Sec ) Noted Discrepancies IRC Spark arrestors (Sec. R ) Spark Arresters, Noted Result There exists Discrepancies between International Code and NFPA 211 Item refers to (1) Devices; and (2) any feature, physical or geometrical properties that are related to top chimney devices. 13

20 Table 8: Dampers Code Code Information Current NFPA211 Gap IMC IFGC IRC Manual dampers (Sec ) 9.9 Dampers Automatic dampers (Sec ) Manually operated dampers (Sec ) Automatically operated vent dampers (Sec ) 9.9.1, 9.9.2, Obstructions (Sec ) Free opening area of chimney dampers (Sec ) No Information Damper (Sec. R ) Dampers , Complete Gap Manually operated (Sec. M ) 9.9.1, Automatically operated (Sec. M ) Free opening area of chimney dampers (Sec. G (634.1)) No Information Complete Gap Result There is partial gap between International Code and NFPA

21 Table 9: Draft Devices Code Code Information Current NFPA211 Gap IMC IFGC Positive pressure (Sec ) Forced draft systems (Sec ) Mechanical draft systems for manually fired appliances and fireplaces (Sec ) Mechanical draft systems (Sec ) Mechanical draft (Sec ) Positive-Pressure Applications Forced/Induced Draft Systems (b) , Mechanical Draft Systems, , 4.1.4Forced/Induced Draft Systems., Natural Draft Vent Connectors, (c) Engineered Venting or Chimney System Positive pressure (Sec ) (3) Additional devices (Sec ) Draft requirements (Sec. M1801.2) , Chimney Flue Mechanical draft systems (Sec. M1801.5) , Forced/Induced Draft Systems Draft regulators (Sec. M1802.3) , A.9.11 IRC Natural draft appliances (Sec. M ) Mechanical draft systems (Sec. M ) Mechanical draft (Sec. G ( )) Additional devices (Sec. G ( )) 4.2.2, , , , Engineered Venting or Chimney System Obstructions (Sec. G (503.15)) 9.7.9, IEBC Mechanical draft systems for manually fired appliances and fireplaces (Sec ) Result There is partial gap between International Code and NFPA

22 Table 10: Decorative Shrouds Code Code Information Current NFPA211 Gap IMC Decorative shrouds (Sec ) Decorative Shrouds IFGC Decorative shrouds (Sec ) IRC Decorative shrouds (Sec. R1004.3) Decorative shrouds (Sec. R1005.2) Decorative shrouds (Sec. M ) , General, General , Decorative Shrouds, General , Decorative Shrouds, General , Decorative Shrouds, General Result There is No gap between International Code and NFPA 211 Table 11: Openings Code Code Information Current NFPA211 Gap IMC Terminal clearances (Sec ) IFGC Liquid fuel-burning appliances (Sec ) Two or more openings (Sec. G ( )) 9.8.3, Result There is partial gap between International Code and NFPA

23 Table 12: Exhaust Terminations Code Code Information Current NFPA211 Gap IBC IMC IRC Termination (Sec ) Table 7.2, FIGURE 4.2(a), FIGURE 4.2(b) Termination height (Sec Termination (Height), Table ) 7.2 Termination height (Sec Termination (Height), Table ) 7.2 Type L vent terminations (Sec ) FIGURE 4.2(a), (b) Termination (Sec ) Partial gap Mechanical draft systems (Sec ) Horizontal terminations (Sec ) Mechanical draft systems (Sec ) Vertical terminations (Sec ) Direct-vent terminations (Sec ) Exhaust outlets. (Sec ), TABLE Chimney termination (Sec ) , FIGURE 4.2(a) , , Vent Cap, Direct Vent Appliances Fired with Gas, Oil, or Pellet Fuels Table 7.2, , , Table Termination (Height), , 4.2.2, , Decorative Shrouds Forced air inlets (Sec ) FIGURE 4.2(a) Termination (Sec ) , FIGURE 4.2(a) Roof terminations (Sec ) Roof Jack., Termination capacity (Sec ) A (1) Gas vent terminations (Sec ) , FIGURE 4.2(a) Minimum height (Sec ) , Termination (Sec. R1003.9) Direct vent terminations (Sec. M ) Chimney termination (Sec. G ( )) Termination (Height), , 4.2.2, , Decorative Shrouds. Result There is partial gap between International Code and NFPA

24 Table 13: Flue and Vent Systems Code Code Information Current NFPA211 Gap IBC Residential-type appliances (general) (Sec ) Minimum area (Sec ) Determination of minimum area (Sec ) Residential-Type and Building Heating Appliances., , , , No information Complete Gap Notice of usage (Sec ) 10.5 Notice of Usage, Flue area (appliance) (Sec ) , Lining (Sec ) IMC Residential and low-heat appliances (general) (Sec ) Minimum vent heights (Sec ) Positive flow (Sec ) Space around lining (Sec ) Flue passageways (Sec ) Residential-Type and Building Heating Appliances., Low-, Medium-, and High-Heat Appliances 4.2.2, , , Pellet Vent Positive-Pressure Applications Space Surrounding Liner or Vent , 14.9 Damaged or Deteriorated Liners Flue lining (Sec ) , Solid fuel appliance flues (Sec ) Flue Cross-Sectional Area Size (Sec ) 14.8 Operating Malfunction Combustion air ducts (Sec ) 5.3 Space Surrounding Liner or Vent., Size (Sec ) 14.8 Operating Malfunction IFGC Size of single-wall metal pipe (Sec ) Vertical vent maximum size (Sec ) Sizing, Space surrounding lining or vent (Sec ) Space Surrounding Liner or Vent, ,

25 Table 13: FLUE AND VENT SYSTEMS (Continued) Code Code Information Current NFPA211 Gap General (Sec ) A Gas vents installed within masonry chimneys (Sec ) , IFGC Residential and low-heat appliances flue lining systems (Sec ) Residential-Type and Building Heating Appliances Low-, Medium-, and High-Heat Appliances. Height entries (Sec ) No Information Complete Gap Vent height measurement Complete No Information (Sec ) Gap Minimum size (Sec ) No Information Complete Gap Chimney and vent locations Complete No Information (Sec ) Gap Chimney and vent location (Sec ) No Information Complete Gap Special gas vent (Sec ) Multiple flues (Sec. R ) Flue area (masonry fireplace) (Sec. R ), R Option 1. R Option Multiple Flues, , , , , , Changes in dimension (Sec. R1003.6) Change in Size or Shape of Flue at Combustible Members IRC Flue lining (material) (Sec. R ) , Residential-type appliances (general). (Sec. R ) Space around lining (Sec. R ) Residential-Type and Building Heating Appliances, Low-, Medium-, and High-Heat Space Surrounding Liner or Vent. Size (Sec. M ) A.9.11, Through the roof (Sec. M )

26 Table 13: FLUE AND VENT SYSTEMS (Continued) Code Code Information Current NFPA211 Gap IRC Type L vent (Sec. M ) Size of chimney flues (Sec. M1805.3) Size of chimney flue for solid-fuel appliance (Sec. M ) , FIGURE 4.2(a) FIGURE 4.2(b) Flue Cross-Sectional Area. Liquid fuel-burning appliances (Sec. G ( )) 9.8.3, Result There is partial gap between International Code and NFPA

27 Table 14: General Information Code Code Information Current NFPA211 Gap IMC Solid fuel appliances (Sec ) , Factory-Built, Residential-Type and Building Heating Appliance Type Chimney. Medium-heat appliances (Sec ) Oil-fired appliances (Sec ) Incinerators (Sec ) IFGC Factory-built chimneys (Sec ) General Factory- Built, Positive Pressure Capable Chimney. Masonry chimneys (Sec ) Listed or Approved Materials, , Listing (Sec. G (506.1)) A Type HT Factory- Built, Residential-Type and/or Building Heating Appliance Type Chimney. IRC Solid-fuel appliances (Sec. R1005.3) , Medium-heat appliances (Sec. R1005.6) Listing (Sec. R1005.1) General. Result There is Partial gap between International Code and NFPA

28 Table 15: Architectural features Code Code Information Current NFPA211 Gap IBC Determination of net pressure coefficients, C net.(sec ) Chimney crickets (Sec. R ) No Information Complete Gap IRC Other flashing (Sec. R ) , FIGURE A.11.2(a) FIGURE A.11.2(b) Crickets and saddles (Sec. R ) No Information Complete Gap Result There is partial gap between International Codes and NFPA 211 Table 16: Clearance Code Code Information Current NFPA211 Gap IBC IMC IFGC IRC Clearance (Sec ) Clearance, Table 7.2, , Clearance (Sec ) Framing around flues and chimneys (Sec ) Clearance, , , Masonry chimneys (Sec ) Table , Clearances (Sec ) Clearances (Sec ) Reduction table (Sec ), TABLE Clearances (Sec. M ) Clearances (Sec. G ( )) Clearance., , , Clearance., , , Table Clearance, , , Clearance., , , Result There is partial gap between International Codes and NFPA

29 References [1] International Building Code, 2015 [2] International Mechanical Code, 2015 [3] International Fuel Gas Code, 2015 [4] International Residential Code, 2015 [5] International Existing Building Code, 2015 [6] International Plumbing Code, 2015 [7] NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances