This Miracle Heat Stove and Furnace Heat Reclaimer helps cut fuel costs by capturing flue heat and circulating warm air back into the room. Fully automatic operation with thermostatically controlled fan.Common usage heat reclaimer Auto on off yes Cfm 110 Mount type install in stove pipe Works with wood, coal stove Volts 120 Includes 1 reclaimerFlue Collar Size: 8 Height: 13 Length: 12-1 2 Width: 16