No matter which sealant you choose for your ducts make sure you choose a high quality product and clean the application area first.
Duct sealant or foil tape.
8 hvac tape mastic sealant reviewed 1.
Nashua trusted tapes get the job done right the first time every time.
Read what i wrote.
3m scotch seal mastic.
Foil or metal tape if you re tackling an hvac job at home aluminum foil tape should be your go to.
Elk elk aluminum foil tape for metal repair air ducts insulated pipes hvac sealing ductwork vapor exhaust and heat resistant safe professional grade insulation sealer silver 1 88 in x 150 ft.
Despite the name dust tape never seal air ducts with duct tape.
Both mastic sealant and aluminum foil tape are good options for sealing air ducts.
Red devil 0841dx f seal 181.
It simply does not hold up.
The answer is in the article on this page.
Hardcast recommends foil grip butyl tape for use with galvanized steel duct duct board or flex duct.
Foil tape is flame resistant holds up in extreme temperatures and sticks strong in high humidity.
Product overview nashua foil mastic sealant tape seals and seams low medium and high pressure sheet metal duct systems and ul listed flexible non metallic ducts.
Aggressive butyl rubber adhesive provides a permanent air and water tight seal.
If you d rather not mess with duct mastic to seal up your hvac system aluminum foil tape is a solid alternative.