Ducts are inherently leaky because of all the joints between duct sections and fittings. Energy is wasted when conditioned air leaks out of ducts, and when unconditioned air leaks in. Leaky ducts also create indoor air quality problems by drawing attic, basement and crawl space air into the ai...
Please see ASBESTOS PAPER DUCT INSULATION and also see ASBESTOS DUCTS, HVAC - where we cite research on these materials as well as advice on action plans when they're present in a building.Question: asbestos in Louisiana-Made Ceiling Tiles from 1971?(...