2020年9月23日 · Applicable code: 2018 IMC Applicable sections: 603.6.2.1 and 603.6.2.2 Flexible air connectors (a.k.a. flex duct) shall be limited in length to 14 feet. Flexible air connectors (a.k.a. flex duct) shall not pass through any wall, floor, or …

2012年2月1日 · Regular flex duct can be run vertically but must be supported every 6 feet and straps must be a minimum of 1.5 inches wide, and even though a lot of contractors are using flex duct most do not follow the manufactures instructions for the installation,sizing and end up causing systems to fail upon delivering air to the space as needed and ...

2009年10月19日 · Although one could argue that plastic is "non-combustible", I am thinking that a plastic flex duct would be acceptable if only it were part of a tested and classified UL assembly.See attachment.Thanks!ICC Certified Plan ReviewerNFPA Certified Fire Plan Examiner View attachment 2031 713-MembranePenetration.pdf 713-MembranePenetration.pdf

2010年3月26日 · Re: Zip Ties On Flex Ducts JayHawk, If I am understanding you correctly the question is if tape is used on flex duct does it have to be marked "181B-FX" and according to IRC 2006 edition section M1601.3.1 yes it would for pressure-sensitive tape or "181B-M" for mastic.

2018年7月6日 · If this shaft were identified as a chase rather than a shaft, 717.6.1 could apply and then "B" would be applicable, fire damper at the floor line because the duct doesn't connect more than two stories (openings in the duct on the second story have no relevance, the duct is connecting the two stories, if openings were relevant, language such as ...

2011年5月26日 · Builder with a slab-on-grade floor. Someone decided to run 4" PVC under the slab for the dryer vent. HVAC inspector called me to see what I thought. Code says it must be constructed with "rigid metal duct, having smooth interior with joints running in the direction of air flow." What do you...

2019年7月2日 · Duct connections to flanges of air distribution system equipment shall be sealed and mechanically fastened. Mechanical fasteners for use with flexible nonmetallic air ducts shall comply with UL 181B and shall be marked "181 B-C." Closure systems used to seal all ductwork shall be installed in accordance with the manufacturer's instructions.

2012年5月15日 · 2.3. The duct shall not have openings that communicate the corridor with adjacent spaces or rooms. 2.4. The duct shall be installed above a ceiling. 2.5. The duct shall not terminate at a wall register in the fire-resistance-rated wall. 2.6. A minimum 12-inch-long (0.30 m) by 0.060-inch-thick (1.52 mm) steel sleeve shall be centered in each ...

2009年10月20日 · Designer is proposing to install flammable flexible air duct material for make up air at a Type I hood. This will ultimately be directly connected to the hood. The plans show a 24" section of "start up" steel duct, then the flexible duct connects to that so that the flammable duct will end up 18" away from the hood, per 506.3.1.2, at all points.

2022年2月16日 · Exception: Where an exhaust duct power ventila- tor, in accordance with Section 504.4.2.3, is used, the maximum length of the dryer exhaust duct shall be permitted to be in accordance with the dryer exhaust duct power ventilator manufacturer’s instal- lation instructions.