Penetrations followed by flex duct within rated floor-ceiling …
2009年10月19日 · Penetrations by ducts and air transfer openings of a floor, floor/ceiling assembly or the ceiling membrane of a roof/ceiling assembly shall be protected by a shaft enclosure that complies with Section 708 or shall comply with Sections 716.6.1 through 716.6.3. 716.6.2 Membrane penetrations.
flex duct - The Building Code Forum
2009年10月19日 · A conduit for transferring air between an air duct or plenum and an air terminal unit or between an air duct or plenum and an air inlet or air outlet. Such conduit is limited in its use, length and location. 603.6.1 Flexible air ducts. Flexible air ducts, both metallic and nonmetallic, shall be tested in accordance with UL 181.
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.
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.
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.
UL-181 tape for ducts - The Building Code Forum
2013年6月13日 · Closure systems used to seal ductwork listed and labeled in accordance with UL 181A shall be marked "181A-P” for pressure-sensitive tape, "181 A-M” for mastic or "181 A-H” for heat-sensitive tape. Closure systems used to seal flexible air ducts and flexible air connectors shall comply with UL 181B and shall be marked "181B-FX” for ...
Bathroom Exhaust - The Building Code Forum
2009年10月17日 · Some flex ductwork is LAL for concealed locations at any length. Flexible dryer connectors cannot be concealed but there are lots of products that can be used for bath exhaust, hvac supply air etc. and can be concealed. Some can be concealed but have a max. 14' run. It all depends on the LAL of the product.
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.
Boosting a Dryer Vent - The Building Code Forum
2009年10月16日 · It is a maximum 35 ft length or what the manufacture of the dryer specifies. 504.6.4.2 Manufacturer’s instructions. The maximum length of the exhaust duct shall be determined by the dryer manufacturer’s installation instructions. The code official shall be provided with a copy of the installation instructions for the make and model of the ...