flex duct - The Building Code Forum
2009年10月19日 · Flexible air ducts, both metallic and nonmetallic, shall be tested in accordance with UL 181. Such ducts shall be listed and labeled as Class 0 or Class 1 flexible air ducts and shall be installed in accordance with Section 304.1. 603.6.1.1 Duct length. Flexible air ducts shall not be limited in length. 603.6.2 Flexible air connectors.
Penetrations followed by flex duct within rated floor-ceiling …
2009年10月19日 · 716.7 Flexible ducts and air connectors. Flexible ducts and air connectors shall not pass through any fire-resistance-rated assembly. Flexible air connectors shall not pass through any wall, floor or ceiling. You may have any duct material you choose located within the fire rated floor/ceiling assembly
Flex Duct - The Building Code Forum
2012年2月1日 · A flexible air connector as listed in IMC 603.6.2 can only have a maximum length of 14 feet 603.6.3 prohibits it from passing through any wall, floor or ceiling and is listed under UL181 but only has to pass 12 of the 15 tests. It does not get tested for flame rate, puncture or impact and thus limits its use.
UL-181 tape for ducts - The Building Code Forum
2013年6月13日 · Mechanical fasteners for use with flexible nonmetallic air ducts shall comply with UL 181B and shall be marked 181B-C. Crimp joints for round metal ducts shall have a contact lap of at least 11/2 inches (38 mm) and shall be mechanically fastened by means of at least three sheet-metal screws or rivets equally spaced around the joint.
Zip Ties On Flex Ducts - The Building Code Forum
2009年10月19日 · fastened. Mechanical fasteners for use with flexible nonmetallic air ducts shall comply with UL 181B and shall be marked 181B-C. Crimp joints for round metal ducts shall have a contact lap of at least 1½ inches (38 mm) and shall be mechanically fastened by means of at least three sheet-metal screws or rivets equally spaced around the joint.
Sealing seams in duct work - The Building Code Forum
2021年3月28日 · specified in SMACNA HVAC Duct Construction Standards—Metal and Flexible and NAIMA Fibrous Glass Duct Construction Standards. Joints, longitudinal and transverse seams, and connections in ductwork shall be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-plus-embedded-fabric systems, liquid sealants or tapes.
UL listed tape used for sealing of mechanical vents
2009年10月28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.
Dryer duct joint connection methods - The Building Code Forum
2011年11月15日 · Mechanical fasteners for use with flexible nonmetallic air ducts shall comply with UL 181B and shall be marked 181B-C. Crimp joints for round metallic ducts shall have a contact lap of not less than 1 inch (25.4 mm) and shall be mechanically fastened by means of not less than three sheet-metal screws or rivets equally spaced around the joint.
diffuser support - The Building Code Forum
2009年10月17日 · Flexible connections between the components and associated ductwork, piping, and conduit are provided. b. The components weigh 20 lb (89 N) or less or, for distribution systems, weighing 5 lb/ft (73 N/m) or less. When the lights or grills exceed 20lb then they need altenate supports or bracing. What is your seismic zone?
Ducted Pentration in Fire Wall - The Building Code Forum
2012年5月15日 · The problem I have is with the following line in NFPA 90A: 5.3.1 Fire-Rated Walls and Partitions. 5.3.1.1* Approved fire dampers shall be provided where air ducts penetrate or terminate at openings in walls or partitions required to have a fire resistance rating of 2 hours or more. Basically...