Indoor air pollutants such as pollen, dust, mold spores, skin cells and animal dander accumulate in supply and return duct work and even in the coil of the HVAC system. These surfaces are hidden from our everyday view and can only be cleaned using proper procedures and specialty equipment. Each time an HVAC system cycles on it causes these foreign accumulations to migrate out of the duct work and into your lungs. Even worse, if mold is growing in your duct work spores and mycotoxins will be released into your breathing air. Most duct work installed in residential homes is now made of fiberglass board that is shaped into duct work. This board comes with a factory coating, but air erosion eventually causes it to break down and fiberglass can be distributed into your home each time the system cycles on. We offer an option with our proposals to seal the duct work using a special paint formulated for use in duct work to re-encapsulate the fiberglass.