Air-conditioning ducts that terminate at a wall or ceiling inside a room have tabs for attaching grills, also known as registers or trim. Drywall is cut to fit at the outer edges of the duct so the grill covers the cut edges. Where ducts penetrate fire-separation walls, such as in garages and attics, drywall is cut to fit against all sides of the duct and caulked or taped to provide the necessary fire rating. The method used to drywall around air-conditioning ducts in rooms is different than the one used at fire-separation walls. Position a stepladder at the area of the duct.
How to Drywall Around Air Conditioning Ducts
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DataDoc to morbo. HarryH3 to morbo. I have always just filled that gap with caulk. Quick, effective and far less expensive than quality foil tape.
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