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A register booster fan from Grainger fits into a floor heating and cooling register to help increase the flow of air in heating and cooling systems. Use register booster fans in rooms or areas that don't get enough heat from the heating system or cooled air from the central air conditioning system. These 120V, 20 watt fans have an air flow rating of 75. Choose from fans to fit 4" x 10" and 4" x 12" openings. Rely on Grainger to help you boost your air flow with an efficient register booster fan.