The AmeriVent 3 inch to 4 inch Type B Gas Vent Increaser (Model 3EIX4)Go to product viewer dialog for this item. is expertly designed to securely increase the vent size for standard gas appliance venting systems. Manufactured with a durable aluminum alloy inner wall and a steel outer wall, this adapter ensures long-lasting reliability and optimal heat retention. It features precise 3 inch inlet and 4 inch outlet dimensions to promote safe and efficient exhaust flow. Perfect for upgrading or servicing heating and venting installations

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