Vogelzang VG2500 Norseman Add-On Furnace Designed to use in conjunction with existing HVAC ductwork and Furnace 115,000 BTUs to heat a home up to 2,500 square feet Dual 550 CFM blowers provide efficient air flow Connection to existing ductwork is easy with two 8-inch diameter heat outlets Adjustable bi-metal thermostat provides automatic controlled combustion for even heating