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Improves circulation of warm air and reduces temperature differences in the room. Optional deluxe blower for increased airflow. Two blowers may be used on 50,000 Btu/hr. Model 2901,100 CFM, shipping weight 9 lbs. Model 2907,125 CFM, shipping weight 9 lbs. Rear-Outlet Register Chain-operated damper with register flush on rear wall, adjusts amount of heat delivered through rear register. Motorized rear-outlet register for increased airflow also available. Model 6901, Standard model, shipping w