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Discussion Starter · #1 ·
My sister just closed on a house that has retrofitted supply ducts in the ceiling. Apparently whoever did this job used the old in slab ducts as the return. There was no filter I could find so I checked the air handler and sure enough there was a filter in the bottom of the unit. It was pretty nasty.

I don’t think it would be a common practice to use old in slab duct work as a return. Has anyone seen this before?
 
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