Fits between window and windowsill to allow the entry of fresh air into the home, while trapping 96% of pollen. Designed for double hung windows (see photo). The sturdy, rustproof aluminum frame holds a replaceable filter cartridge. The filter also keeps out insects, rain, and wind, while minimizing noise. Seven-inch high model adjusts from 20 x 36 wide; eleven-inch high model adjusts from 25 x 44 wide.
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