Return air vent cover

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Help your heating or cooling system work more efficiently! In summer, cover the floor level return air register with a magnetic sheet so only warmer, ceiling level air is returned. In winter, use a magnetic vent cover over the ceiling level return air...
 
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Help forced-air systems run more efficiently. In winter, cover ceiling-level return air registers; cooler air returns to furnace. In summer, cover floor registers for cooler air. May be cut to fit and painted.
 
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17-3/4" x 9-3/4" Actual Size 16" X 8" Hole to Cover Cold Air Return White Louvered 1/3", Manufacturer: Continental
 
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15-3/4" x 9-3/4" Actual Size 14" X 8" Hole to Cover Cold Air Return White Louvered 1/3", Manufacturer: Continental