Air-supply and return ducts can be a medium for mold growth or (with insulated ducts) a source of fiber-shedding, both of which can pose significant indoor air quality concerns.
Products listed here allow easy duct cleaning, or protect against mold growth or fiber-shedding. See 22 07 00 – Plumbing Insulation for information on pipe insulation, including that used for hydronic and steam heating. Also included here are specialized insulation products for piping and other mechanical equipment.
Products in HVAC Insulation