What is the best sealant for air ducts?

Water-based putty duct sealant is the best choice because it cleans more easily and is maintained for a long time. When using duct sealant with putty on your own, you can apply it with a simple brush. You can also use a caulking gun to apply duct putty, although it's not necessary. Assuming that the cover is sealed against the plaster and that the duct system is relatively hermetic, there is no need to place an airtight seal between the grille and the cover.

In addition, leaking ducts can cause distant rooms to receive less airflow than expected by the duct designer.

Adele Mikell
Adele Mikell

Proud travel lover. Hardcore coffee practitioner. Evil tv guru. Devoted twitter ninja. Hardcore zombie trailblazer. Hardcore beer lover.

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