Johns Manville Releases the First Flexible R-12 Fiberglass Duct Liner
DENVER — Johns Manville has released the first flexible fiberglass duct liner with an R-12 thermal resistivity rating.
The innovative insulation is designed specifically to meet new code requirements set forth by the IECC in 2015 that mandate the use of R-12 insulation on ducts in unconditioned spaces in climate zones 5-8.