Sep 23, 2020 · 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 …

Feb 1, 2012 · 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 …

Nov 30, 2009 · What I have seen is the insulated flex is listed as duct, and the foil uninsulated flex is listed as an air connector (if listed at all). In either case, the product needs to be Ul 181 …

Oct 19, 2009 · Duct connections to flanges of air distribution system equipment or sheet metal fittings shall be mechanically fastened. Mechanical fasteners for use with flexible nonmetallic …

Oct 19, 2009 · The answer to the flex duct question is the flex duct shall not penetrate the ceiling line. If it does it is in violation of 716.7 Flexible ducts and air connectors. Flexible ducts and air …

May 17, 2012 · G2439.5.5.1 (614.6.5.1) Specified length. The maximum length of the exhaust duct shall be 35 feet (10 668 mm) from the connection to the transition duct from the dryer to …

Dec 13, 2013 · Ducts shall be supported with approved hangers at intervals not exceeding 10 feet (3048 mm) or by other approved duct support systems designed in accordance with the …

Jun 13, 2013 · Closure systems used with flexible air ducts and flexible air connectors shall comply with UL 181B and shall be marked181B-FX for pressure-sensitive tape or 181B-M for …

Oct 28, 2009 · Tapes and mastics used to seal metallic and flexible air ducts and flexible air connectors shall comply with UL 181B and shall be marked "181 B-FX" for pressure-sensitive …

Nov 13, 2011 · The electrical inspector has a code for that. Diffusers are an apurtinence to a duct. Duct requires support per the Mech. Code. With flexible duct, common sense calls for …