USSC 1500 Hotblast, Wood/coal With Twin 550 CFM Blowers Feature: The 1500 add on furnace is designed to use in conjunction with your existing HVAC ductwork and work seamlessly with your existing furnace. With twin 550 CFM blowers and up to 139,000btu's it is designed to heat a home up to 2500 sq. ft. This unit is made with a firebrick lined plate steel firebox surrounded by brilliant red painted steel giving the unit an eye appealing look. Connection to your existing ductwork is easy with the two 8 diameter heat outlets. Available accessories include the Universal filter box Kit. Installation materials are NOT Included (i.e. floor protector, chimney connector, thimble, radiation shield, flue) Twin 550 CFM blowers provide redundancy and large amounts of air flow 6 Flue Collar Dual 8 diameter Heat Outlets Automatic Bi-Metal draft damper Firebrick lined to boost efficiency and heating capacity Separate Ash doo...