Second Revision No. 10-NFPA [ Section No. 2.4 ] Submitter Information Verification. Committee Statement 6/15/ :19 PM

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1 Second Revision No. 10-NFPA [ Section No. 2.4 ] 2.4 References for Extracts in Mandatory Sections. NFPA 31, Standard for the Installation of Oil-Burning Equipment, edition. NFPA 54, National Fuel Gas Code, 2015 edition. NFPA 85, Boiler and Combustion Systems Hazards Code, 2015 edition. NFPA 5000, Building Construction and Safety Code, 2015 edition. Submitter Full Name: ERIC NETTE Organization: NFPA Submittal Date: Tue Apr 07 13:27:37 EDT 2015 : NFPA 31 referenced a prior edition and had to be updated.

2 Second Revision No. 3-NFPA [ Section No ] Accessories y. Supplementary part or device added to an appliance to make it more useful, versatile, attractive, and so forth * Factory-Built Fireplace System Accessories. Accessories intended for field installation into or attachment to factory-built fireplaces systems * Masonry Fireplace and Chimney Accessories. Accessories intended for field installation into or attachment to masonry fireplaces or chimneys. Submitter Full Name: Eric Nette Organization: [ Not Specified ] Submittal Date: Thu Mar 19 10:22:17 EDT 2015 Adding a definition of the term "accessory" is needed as part of a solution to confusion regarding fireplace accessories (something added for enhancement as defined here) and components. In addition, the definitions here of factory-built and masonry fireplace accessories both incorrectly imply that there are accessories that can be added to chimneys. Removing the word "systems" from and "or chimneys" from leaves the definitions correctly applicable to the firebox of each type of fireplace. Public Comment No. 119-NFPA [Section No ] Public Comment No. 16-NFPA [Section No ] Public Comment No. 54-NFPA [Section No ] Public Comment No. 55-NFPA [Section No ] Public Comment No. 152-NFPA [Section No ] Public Comment No. 60-NFPA [Section No ] Public Comment No. 61-NFPA [Section No ] Public Comment No. 89-NFPA [Section No ] Public Comment No. 150-NFPA [Section No ] Public Comment No. 116-NFPA [Section No ] Public Comment No. 91-NFPA [Section No ] Public Comment No. 108-NFPA [Section No ] Public Comment No. 70-NFPA [Section No ]

3 Second Revision No. 11-NFPA [ Section No ] Corbeling.

4 Individual and maximum projections of corbels in masonry chimneys shall comply with the requirements of this section. [See Figure 7.1.2(a) through Figure 7.1.2(e) Figure 7.1.2(d).] Figure 7.1.2(a) Corbels for Supporting Chimneys. Figure 7.1.2(b) Corbels to Change Chimney Direction. Figure 7.1.2(c) Corbels to Increase Chimney Wall Thickness.

5 Figure 7.1.2(d) Corbels to Support Flue Lining. Figure 7.1.2(e) Corbels to Incorporate Wall Pass-Through.

6 Corbeling limitations shall be permitted to be varied for engineered, reinforced, brick masonry construction Individual corbels occurring at any point within a masonry chimney shall not exceed one-half the individual masonry unit height or one-third the thickness The following shall apply to masonry chimney supports: (1) They shall be permitted to be formed by corbeling from a wall that is not less than 12 in. (305 mm) in thickness to form a maximum total projection of not more than one-half the wall thickness. (2) Where the corbeling specified in (1) projects equally on each side of the wall, the masonry chimney support shall be permitted to be formed by corbeling from a wall that is not less than 8 in. (203 mm) in thickness to form a maximum total projection on each side of the wall that is not more than one-half the wall thickness Corbeling used to change the direction of a masonry chimney shall have a maximum offset so that the centerline of the upper flue does not fall beyond the center of the lower flue wall. The cross-sectional area of the flue shall not be reduced throughout the offset Corbeling used to increase the chimney wall thickness shall have a maximum total projection that does not exceed the thickness of the chimney wall Corbeled or solid masonry shall be provided in masonry chimneys to support the entire perimeter of flue liners Where a flue is constructed of two flue liners without a separation, three sides of each flue liner shall be supported entirely on corbeled masonry Corbels shall be made with solid units, and, where corbels are located on the walls of hollow masonry units, there shall be no fewer than three courses of solid masonry units below the corbels Corbeling used to incorporate wall pass-through shall be constructed in accordance with and Figure 7.1.2(e). Submitter Full Name: ERIC NETTE Organization: NATIONAL FIRE PROTECTION ASSOC Submittal Date: Fri Jun 05 14:31:50 EDT 2015 The committee did not agree with the edited figure provided by NFPA and has formed a Task Group to address the editing of this figure for the next revision cycle. Public Comment No. 49-NFPA [Section No ]

7 Second Revision No. 4-NFPA [ Section No ] Connectors for residential-type appliances (Table , Column I) shall be permitted to pass through walls or partitions constructed of combustible material if one of the following is true of the connector: (1) It is listed for wall pass-through and is installed in accordance with the conditions of the listing. (2) It is incorporated into the chimney construction in accordance with (3) It is installed in accordance with one of the methods described in Figure Figure Chimney Connector Systems and Clearances from Combustible Walls for Residential Heating Appliances. Submitter Full Name: Eric Nette Organization: [ Not Specified ] Submittal Date: Thu Mar 19 11:42:34 EDT 2015 The four wall pass through methods described in Figure (previous editions) were added to the code based on research and testing that indicated they provided acceptable levels of safety. There was no evidence presented to the contrary and these field constructed options are being returned to the body of the standard. Public Comment No. 17-NFPA [Section No ] Public Comment No. 121-NFPA [Section No ]

8 Public Comment No. 67-NFPA [Section No ]

9 Second Revision No. 9-NFPA [ New Section after ] Maximum Run. Clothes dryer exhaust ducts shall have a maximum length not exceeding 35 ft (10.7 m) as measured from the dryer terminal to the outlet Reductions of ft (0.76 m) shall be made in the maximum length of the duct for each 45-degree bend and 5 ft (1.5 m) in the maximum length of the duct for each 90-degree bend The transition duct shall not be included in the maximum length of the duct Where the dryer manufacturer s installation instructions regarding maximum length of exhaust ducts is different from the maximum length specified in , the exhaust duct shall be installed in accordance with the dryer manufacturer s installation instructions. Submitter Full Name: ERIC NETTE Organization: NFPA Submittal Date: Mon Mar 23 13:26:45 EDT 2015 The International Mechanical Code 2009 section states: The maximum length of the exhaust duct shall be 35 feet NFPA reports that in 2010, an estimated 16,800 reported US non-confined or confined home structure fires involving clothes dryers or washing machines resulted in 51 civilian deaths, 380 civilian injuries and $236 million in direct property damage. Clothes dryers accounted for 92% of the fires. The leading cause of home clothes dryer and washer fires was failure to clean (32%). This revision is in line with NFPA's mission "to reduce the worldwide burden of fire..." Long of exhaust runs will cause a build up of lint as air flow diminishes on longer runs. This ultimately reduces the risk of fire. Public Comment No. 51-NFPA [New Section after ]

10 Second Revision No. 7-NFPA [ Section No ] Factory-built fireplace system accessories shall be one of the following: Listed for use with the specific factory-built fireplace and installed in accordance with the terms of their listing Acceptable to the AHJ and installed as approved and in accordance with the manufacturer s installation instructions installed in accordance with the fireplace manufacturer s installation instructions. Submitter Full Name: Eric Nette Organization: [ Not Specified ] Submittal Date: Thu Mar 19 12:50:52 EDT 2015 This eliminates the concern over requiring gas log sets and other accessories to be listed for a specific fireplace. Public Comment No. 36-NFPA [Section No ] Public Comment No. 14-NFPA [Section No ] Public Comment No. 23-NFPA [Section No ] Public Comment No. 27-NFPA [Section No ] Public Comment No. 28-NFPA [Section No ] Public Comment No. 63-NFPA [Section No ] Public Comment No. 74-NFPA [Section No ] Public Comment No. 76-NFPA [Section No ] Public Comment No. 85-NFPA [Section No ] Public Comment No. 87-NFPA [Section No ] Public Comment No. 104-NFPA [Section No ] Public Comment No. 109-NFPA [Section No ] Public Comment No. 117-NFPA [Section No ] Public Comment No. 135-NFPA [Section No ] Public Comment No. 136-NFPA [Section No ] Public Comment No. 141-NFPA [Section No ] Public Comment No. 149-NFPA [Section No ] Public Comment No. 153-NFPA [Section No ] 0

11 Second Revision No. 1-NFPA [ Section No ] * Masonry Fireplace Accessories. Fireplace accessories shall be one of the following: (1) Installed by a qualified agency (2) Listed and installed in accordance with the terms of their listing (3) Acceptable to the AHJ and installed as approved and in accordance with the Installed in accordance with the accessory manufacturer's installation instructions Submitter Full Name: Eric Nette Organization: [ Not Specified ] Submittal Date: Wed Mar 18 10:41:23 EDT 2015 The Technical has: 1. Removed the requirement to get approval through the AHJ for Accessories 2. Clarified that the ACCESSORY Manufacturer is the manufacturer supplying the installation instructions where applicable 3. Clarified that it can be installed by a qualified agency (see ) 4. Removed the requirement for listed accessories Public Comment No. 52-NFPA [Section No ] Public Comment No. 37-NFPA [Section No ] Public Comment No. 41-NFPA [Section No ] Public Comment No. 25-NFPA [Section No ] Public Comment No. 4-NFPA [Section No ] Public Comment No. 59-NFPA [Section No ] Public Comment No. 98-NFPA [Section No ] Public Comment No. 88-NFPA [Section No ] Public Comment No. 110-NFPA [Section No ] Public Comment No. 148-NFPA [Section No ] Public Comment No. 69-NFPA [Section No ] 1

12 Second Revision No. 2-NFPA [ Sections , ] Only Factory-built chimney components or accessories shall be listed or approved for use with the specific model of factory-built chimney system if the components and or accessories tested for use with the specific model of factory-built chimney shall be permitted are available If original manufacturer s listed components or accessories are unavailable, components or accessories acceptable to and installed by a qualified agency shall be installed in accordance with the component or accessory manufacturer's installation instructions Only listed or approved Factory-built fireplace components or accessories shall be listed or approved for use with the specific model of factory-built fireplace system if the components or accessories for use with the specific model of factory-built fireplace system shall be permitted are available If original manufacturer's listed components or accessories are unavailable, components or accessories acceptable to and installed by a qualified agency shall be installed in accordance with the component or accessory manufacturer s installation instructions. Submitter Full Name: Eric Nette Organization: [ Not Specified ] Submittal Date: Thu Mar 19 08:27:50 EDT 2015 The committee wanted to direct maintenance to install/repair with OEM parts when available, but if these parts are not available the committee wanted to let a Qualified Agency install an acceptable component according to that components manufacturer's instructions. Public Comment No. 75-NFPA [Sections , ] Public Comment No. 39-NFPA [Section No ] Public Comment No. 145-NFPA [Section No ] Public Comment No. 38-NFPA [Section No ] Public Comment No. 45-NFPA [Section No ] Public Comment No. 57-NFPA [Section No ] Public Comment No. 58-NFPA [Section No ] Public Comment No. 155-NFPA [Sections , ] Public Comment No. 80-NFPA [Sections , ] Public Comment No. 138-NFPA [Section No ] Public Comment No. 93-NFPA [New Section after ] Public Comment No. 122-NFPA [Section No ] Public Comment No. 64-NFPA [Sections , ] Public Comment No. 86-NFPA [Sections , ] 2

13 3 Public Comment No. 144-NFPA [Section No ] Public Comment No. 118-NFPA [Section No ] Public Comment No. 112-NFPA [Section No ] Public Comment No. 137-NFPA [Sections , ] Public Comment No. 154-NFPA [Sections , ] Public Comment No. 111-NFPA [Section No ]

14 Second Revision No. 5-NFPA [ Chapter B ] Annex B Field Constructed Wall Pass-Through Systems This annex is not a part of the requirements of this NFPA document but is included for informational purposes only. B.1 General. Annex B provides information on field-constructed wall pass-through systems. This annex provides a method by which to identify or compare old systems to ensure that they were installed and maintained in accordance with the grandfathered method, and it is reprinted here for the convenience of those where such systems exist. This annex does not apply to new construction of wall pass-throughs. See for requirements on new wall pass-through systems. B.2 The following applies to existing wall pass-through connectors for residential-type appliances ( Table , Column I) with inside diameters less than or equal to 10 in. (254 mm): The connectors can pass through walls or partitions constructed of combustible material to a masonry chimney, provided the connector system selected or fabricated is installed in accordance with the conditions and clearances specified in Figure B.2. Any unexposed metal that is used as part of a wall pass-through system and is exposed to flue gases must be constructed of stainless steel or other equivalent material that resists corrosion, softening, or cracking from flue gases at temperatures up to 1800 F (982 C). Insulation material used as part of a wall pass-through system must be of noncombustible material and have a thermal conductivity of 1.0 Btu-in./hr-ft 2 - F (0.14 W/m-K). Any material used to close up an opening for the connector must be of noncombustible material. A connector to a masonry chimney, except for System B in Figure B.2, must extend in one continuous piece through the wall pass-through system and the chimney wall to the inner face of the flue liner, but not beyond. Figure B.2 Chimney Connector Systems and Clearances from Combustible Walls for Residential Heating Appliances. 4

15 5 Submitter Full Name: Eric Nette Organization: [ Not Specified ] Submittal Date: Thu Mar 19 11:46:45 EDT 2015 This material is being removed from the Annex and returned to the body of the Standard. The four wall pass through methods described in the figure were added to the code based on research and testing that indicated they provided acceptable levels of safety. There was no evidence presented to the contrary and the addition of this material into the body of the standard was performed with SR-4. Public Comment No. 68-NFPA [Chapter B]