What are the requirements for supply ducts in an attic?
What are the requirements for supply ducts in an attic? Supply ducts in an unconditioned attic must have insulation equal to or greater than R-6. All other supply ducts and all return ducts in unconditioned spaces must have insulation equal to or greater than R-6. Total rater-measured duct leakage must be equal to or less than 8 CFM25 per 100 square feet of conditioned area. What causes condensation to build up in Attic air conditioner? The condensation drain line is plugged. Air handling units in attics should have a secondary condensation pan in case the primary condensation pan overflows. Occasionally,...