Leaks in HVAC ducts allow air from your furnace or air conditioner to escape, wasting energy and raising heating and cooling costs.
To seal holes or tears in ductwork:
Watch this video to find out more.
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Leaks in ductwork are often found where lines branch off or separate. With the furnace fan running, you can feel air escaping the duct. Once you’ve found the leak, use foil duct tape to cover the gap and seal the leak.
For an extra layer of protection, use a paint brush to apply a coat of duct mastic. This thick, sticky material will dry to form an airtight seal that will keep the air in those ducts where it belongs.