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You cannot use PVC in an are used as plenum air return, such as a ceiling designed as such. Sometimes a tile ceiling will be used as the actual return air duct for the air conditioning system, and no PVC can be used in such a space.
 

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You cannot use PVC in an are used as plenum air return, such as a ceiling designed as such. Sometimes a tile ceiling will be used as the actual return air duct for the air conditioning system, and no PVC can be used in such a space.
Very true, and very common for the above-ceiling plenum to be used for R/A in commercial buildings! :thumbsup:
 
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