Duct Leakage Testing for New Construction in Massachusetts 2026 Duct leakage testing is required for all new construction with forced air HVAC systems in Massachusetts Stretch Code municipalities. HERS Rating...
Complete guide to duct leakage testing in Massachusetts. MA Stretch Code 2021 requires 4 CFM25 per 100 sq ft. Learn cost, process, and what to do if you fail.
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