Flexible HVAC ductwork was first patented in 1965; however, the underlying technology has been used for more than 150 years in the form of flexible air hoses for connecting train cars, flexible metal ...
The K-Flex Gray™ elastomeric insulation duct liner has been improved. It now has an R-value of 4.2, which meets the Energy Conservation Code requirements of states that require a 4.2 R-value in ...
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