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These are examples of a “a technique” heating or air conditioning duct design – all HVAC air originates in the basement and is “conditioned” earlier than being blown into the constructing. This is essentially the most expensive and least healthy duct design. at Return Duct Air Leaks & What They Mean we summarize the impact of missing or open return air ducts.
I use 3M brushable seam sealer which you can buy on Amazon, be certain to scrub the floor extremely well and use rubbing alcohol on the floor before making use of the sealer. The rubbing alcohol will take away any oils or grease on the floor and the seam sealer will bond completely. Let me know the way you make out, thanks.