Sep 23, 2020 · 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 …

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 …

Oct 19, 2009 · 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 …

Oct 19, 2009 · 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 …

May 26, 2011 · 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 …

May 15, 2012 · 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 …

Oct 28, 2009 · Duct connections to flanges of air distribution system equipment shall be sealed and mechanically fastened. Mechanical fasteners for use with flexible nonmetallic air ducts …

Jan 28, 2010 · Doing a plan review for a project that will be under the 2012 IMC. In the 2012 code, exception 3 under fire barriers (607.5.2) allowing for no fire dampers if the duct system …

Mar 19, 2025 · That's the variables for a properly designed duct system, and that's based on 100 equivalent feet of duct. Residential duct should be designed per ACCA manual D. More length …

Oct 20, 2009 · 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" …