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Air seal around kitchen and bathroom exhaust fans to keep conditioned air from leaking into unconditioned space.
Right – Cleanly cut and properly sized hole
Right – Fan with a cleanly cut and properly sized hole has been air sealed to drywall
Right – Kitchen exhaust penetration has been sealed with caulk
Wrong – Kitchen exhaust has not been air sealed
Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal
Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal