Air-Flow Enhancer. When you need to increase air movement between rooms, the Perfect Balance In-Door Pressure Balancer offers a more elegant solution than leaving an enormous gap beneath the door. The 24-inch-by-4-inch grille is made of high-impact ABS plastic and features an interior baffle to reduce noise and light transmission. Though it’s made only in white, it can be painted to match any color scheme, says the maker. Prices are $30 for one unit, $80 for a three-pack. Tamarack Technologies, 800/222-5932,

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