Join Date: Jan 2017
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Re: Polyurethane foam insulation
Insulation rated OK for return air plenums are much less hazardous.
I'd want to get more info on the firm did the job, is that application pretty common, at least mainstream, etc,
in what country was the work performed? Did insurance know about it?
If all that passes the smell test, likely no need to become an expert yourself, just exercising a bit extra caution probably more than makes up for it.