In the early days of insulated flexible duct, each manufacturer published their individual thermal values (R-Value) using various methods and test standards which caused confusion in the marketplace. Over time engineers, contractors and code officials required a standardized method to correctly determine and compare flex duct thermal values. The Air Duct Council (ADC), the association of North American flexible duct manufacturers, determined early in its formation that flex duct R-Values needed to be consistent throughout… Read More