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No matter which sealant you choose for your ducts make sure you choose a high quality product and clean the application area first.
Hvac duct sealant mastic. High pressure duct with hardcast ccw181 white heavily fibrous mastic applied at every seam joint and penetration. It dries to a tough flexible and weather resistant seal. Despite the name dust tape never seal air ducts with duct tape. 324a premium foil ul listed hvac tape.
For pricing and availability. One of the most overlooked tools of the trade is duct tape and mastic sealants. Design polymerics 64 fl oz gray duct sealant. If your insulated flex duct has an intact vinyl sleeve it s save to bury the ductwork in insulation.
This article will cover the various sealants needed to prevent or repair hvac ducting leaks why you should never use duck tape brand tapes non hvac rated and offer you the 8 best hvac duct tape and mastic sealants reviewed and compared. Hvac duct fittings duct sealants. It simply does not hold up. Hardcast manufactures water and solvent based liquid applied mastic sealants for sealing metal flexible and rigid fiberglass ductwork.
Sealing air duct plenums takeoffs elbows and vent boots where they connect and sealing the seams per product instructions may help save energy. 7 mastic is a premium grade sealant used to seal the fabricated joints seams of sheet metal air ducts rigid fiberglass air ducts flexible air ducts thermal insulation crawl space vapor retarders conditioned spaces from air infiltration. These products are listed by ul underwriters laboratory having ul 181 a m and or ul 181 b m. Water base duct mastic sealant master flow 3 in.
4 products in duct sealants. Weather resistant made in the usa water borne low odor earns leed credits non flammable. The mastic sealants are either fiber reinforced or non reinforced and are available in white or gray. Seal the exterior vapor barrier sleeve with a drawband and tape.
Fiberglass weave nashua tape 2 5 in. Both mastic sealant and aluminum foil tape are good options for sealing air ducts. Seal the joint between the inner section of duct and the fitting with high quality duct tape or mastic.
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