How Can I Seal a Leaking Air Duct to Improve HVAC Efficiency?
You can seal small duct leaks with HVAC mastic or foil tape after turning off your system. Larger gaps or damaged ductwork should be professionally repaired.
- Inspect accessible joints, boots, and connections.
- Clean and dry surfaces.
- Apply mastic or UL-rated foil tape to seams.
- Strap and straighten sagging flex runs.
- Recheck for air noise and airflow changes. Fix-it 24/7 provides air duct repair, maintenance, and full residential and commercial duct cleaning in Charleston and Summerville. Green Club members receive 15% off duct cleaning.
Updated: 2025-12-24 00:00:00
Need help in Moncks Corner, SC? Call (843) 305-8086 or book online.
Sources
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