Miles Kimball 4 x 12 Brown Vent-Miser

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With Vent-Miser, stop heating and cooling unoccupied rooms and start saving on energy bills! Battery-operated vent with timer can be set to automatically open and close-forcing air from unoccupied rooms into other parts of the house. Vent-Miser works independently of heating/cooling systems; digital module removes for programming. Specify size: 4" x 12", 4" x 10", 2" x 12". Uses 2 AAA batteries (not included).