Over time the flexible plastic can also become brittle ... In unconditioned attics or crawlspaces, insulate the duct. Bathroom vent ducts must always terminate on the outside of the house.

The ANSI-recognized national standard for residential HVAC duct design will help you design a duct ... sag and compression in flexible ducts; and new equivalent length values for flex duct junction ...

The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) has published the fourth edition of its HVAC Duct Systems Inspection Guide.

Domus Ventilation is proud to announce that its industry leading ventilation ducting will now be manufactured primarily from ...