Heating & Air Conditioning Booster Fan Boosts vent airflow by up to 80% quietly. Saves $$$ on heating/cooling bills. Installs in seconds over existing register. Automatically switches on when airflow is sensed. Adjustable electronic thermostat built-in. Depending on the season, lowering or raising your thermostat just 4 can cost an additional $35 to $50 per month. Running a booster over the same period costs about 60 cents! Just place over standard 12 x 6 floor register and plug into a 110V outlet. For wall vents, the booster easily installs with 4 screws. Features automatic or manual operation. 12'' x 6-1/4'' x 3-1/4''
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