7MC - Type B Gas Vent Chimney Cap - 7"Metal Fab 7MC Type B Gas Vent Chimney Cap 7" The Metal Fab 7MC Type B Gas Vent Chimney Cap is designed to provide superior protection for your vent system by keeping out rain, debris, and animals while allowing for proper exhaust flow. Built from durable galvanized steel, this cap fits securely on 7 inch Type B gas vents and promotes safe, efficient venting for gas fired appliances such as furnaces, water heaters, and boilers. Its twist lock design
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