ducts
The residential duct work supply and return plenums are fiber board. Insulated flexible ducts run off of these plenums to supply diffussers and return grilles. I am very interested in learning their duct cleaning procedure that can actually clean the inside of these ducts without damaging them. If the interior lining on the plenums is broken loose fiber glass will be in the supply air. If the flex is ripped supply air will discharge in the attic. If the return flex is ripped then attic air and house insulation can get into system.
This type of system is very common all over Florida and I suppose many other southern states. Up north the better systems have metal ducts w wrapped insulation and a minimum of insulated duct off of the metal duct at each diffusser.
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