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I have my subflooring up and access to my return air duct between the joists. Is it okay to run mastic on the inside of the bay, between wood and metal to seal up some gaps?

Anything else I should use?
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I have my subflooring up and access to my return air duct between the joists. Is it okay to run mastic on the inside of the bay, between wood and metal to seal up some gaps?

Anything else I should use?
No one seals joist pans. There isn't much point if the filter is at the furnace/ air handler.
 
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