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NEW! Attic Airlock Prevents Hot Air From Entering Attic While Inlet Closes Energy savings with lower fuel consumption Creates air chamber between room and attic, thus reducing condensation in attic and increasing life of building Prevents hot air from entering attic while inlet closes Minimizes chance of inlet freezing up in extreme cold weather conditions PATENT PENDING Attic Airlock Ship Weight: Approx. 4 lbs.