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 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 ...

Learn more. Your home’s ductwork is a vital part of your AC system. It’s what keeps cool air flowing from your AC unit throughout your home in the summertime and warm air flowing from your furnace in ...