Sun-Powered Fan. Broan’s 20-watt Solar-Powered Attic Ventilator can ventilate up to 1,600 square feet. It features an efficient ultra-quiet DC motor and a highly sensitive solar panel that keeps the fan blades turning even in low light, says the maker. The fan can be configured for surface-mount, curb-mount, or gable-mount installation, and the solar panel can be placed in a separate location. The product comes in three colors and costs about $1,200. Broan-NuTone, 800/558-1711,

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