The ComfortBilt HP22i Pellet Stove Fireplace Insert takes the tremendous performance and efficiency of the HP22 free-standing pellet stove and offers it as an attractive fireplace insert model. Along with heated air from the room blower, the bay view window radiates heat in three directions. The ComfortBilt HP22i Pellet Stove Fireplace Insert features: Certified 50,000 BTU output will heat a 2,800 ft² or more if temperatures are mild EPA and CSA Certified to comply with all federal emissions mandates Heat exchanger design and powerful room blower produce maximum heat from pellets Easy to clean heavy gauge exterior 47 pound hopper capacity; ashes fall automatically into a fixed ash container Five power settings allow up to 18 hours of continuous burning on lowest setting Programmable thermostat for constant temperature and economical pellet use Rear mounted 3” standard exhaust port, and 2” standard air intake Requires a cavity at least 24.5” high, 18” deep, and 21” wide Fireplace finishing cover shroud is 42” wide and 33” high All HP22I insert models are shipped with a free ash vacuum - a $59.99 value