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  1. HVAC
    Hi, I am installing a new HVAC system in my house. I will be installing a 4 Ton heat pump in Maryland. I believe that is 1600 CFM's. I will be using the reducing plenum duct design. Currently, I have the following: Metal Return Duct size: 12x28 @ 686fpm w/ 2 Return grills FILTERED @ 24x24 The...
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