Chimney Extension - Insulated 6" x 48"

The Polar Vortex Is Back - 25% OFF on all items! Don’t Risk Losing Heat   Don’t wait until the cold hits hard. Protect your heat system and stay warm with our biggest savings of the season. Stay ready. Stay warm.   Sale ends December 11 — shop now before it’s 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 agr