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Air seal around all duct shafts and flues installed through ceilings, walls, or flooring to keep conditioned air from leaking into unconditioned space.
Form a sheet metal shield around the flue pipe
Form sheet metal shield around pipe keeping 3-inch clearance
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Right – Chase capped with rigid air barrier and duct work penetrations properly sealed
Right – Neatly cut and sealed penetration
Right – Penetrations have been neatly cut and properly sealed with foam
Right – Vent and air barrier sealed
Seal all wood framing joints surrounding the chase with sealant and lay a bead of sealant along top edge of chase framing
Seal all wood framing joints surrounding the chase with sealant and lay a bead of sealant on top edge of chase framing
Spray foam air seals the boot to the ceiling
Wrong – Chase not capped
Wrong – Fibrous insulation does not air seal
Wrong – Penetration hole is larger than duct and not sealed
Wrong – Vent sleeve not completely sealed