Chimney Extension - Insulated 6" x 48"

42% OFF - This Week Only! Get an additional 12% discount with promo code “12OFF” on select items. We’re offering massive markdowns on a wide selection of products, priced below wholesale! This is your chance to grab incredible deals before they’re gone. Chimney Extension - Insulated 6" x 48". This product meets specifications for all GX model furnaces among many others. (NOTE: This 6" size will NOT fit HE, GH, and BHS model furnaces.) All Chimney extensions are shown by their INSIDE diameter and length. The outside diameter is always 2 inches wider. Accordingly, this product has an OD of 8". NEVER use an uninsulated chimney extension. Outdoor wood boiler exhaust contains high amounts of steam from the wood fuel, and this steam must exit the furnace without condensing on the chimney wall. If the chimney wall is uninsulated, this steam will condense on the chimney wall, and highly acidic moisture will ruin most boilers in less than a few months. Outdoor Boiler experts agree that only