The exterior of fiberboards includes a foil masking that serves as the two an air and moisture barrier. By themselves, fiberboard ducts are superb insulators and don't require any more insulation. Beyond its essential job of air distribution, perfectly-intended and taken care of ductwork contributes noticeably to your energy effectiveness https://beaueggec.wikinstructions.com/1517799/how_pu_ducts_can_save_you_time_stress_and_money