PVC coated underground metal duct with coated spiral also. Most of our systems go overhead, very rare to have underground return, this one also got supply. Original design was for unico high velocity system, but unico said it would not work as designed, so we had a lot of ductwork under slab. Has anyone else ever had to do this? The unit is a Trane multi position, only the second down flow unit I had installed in new construction. 
I have pics of the underground somewhere, still looking for those.
I have pics of the underground somewhere, still looking for those.
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