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  1. zar45

    Supply Air Duct Condensation Temperature

    2021 IECC C403.12.1 ... Exception 2 says the duct does not require insulation if the "design temperature difference between the interior and exterior of the duct or plenum is not greater than 15°F". I error on the side of insulation. Especially in moist climate zones.
  2. zar45

    Calculated CFM higher than stock equipment

    Yes, it is best to match the required tonnage, especially the sensible cooling btuh.

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