👉 Insulation inside an air handler return box shouldn’t be installed upside down because the vapor barrier (usually foil or kraft paper) must face the warm, moist air to prevent condensation and mold buildup overtime. 👉 Installing it backwards causes moisture to trap inside the insulation, leading to deterioration, reduced efficiency, and potential contamination of the inside living space. 👉 Seams must be sealed properly to avoid moisture, condensation and/or untreated air to scape from the s
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👉 Insulation inside an air handler return box shouldn’t be installed u…
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