These roof ventilations with fan feature 3-speeds and a silent operation They have polycarbonate domes and a removable screen for trouble-free cleaning Fit onto any standard 14"x14" opening Built-in thermostat These 12 volt roof ventilation fans are designed to ensure constant temperatures. They operate when the thermostat calls for cooler air. Once the thermostat is satisfied, the fan shuts off automatically. Model with sensors has an automatic dome opener with a built-in rain sensor. Dome over vent will remain open until the built-in rain sensor becomes wet. Once the sensor dries, the door will re-open. These roof ventilation fan vents fit a 14" x 14" opening and 4-1⁄ 4" to 5-3⁄ 4" roof thickness. Operation: 920cfm, 3-amp on high, 658cfm, 2.29-amp on medium and 478cfm, 1.86-amp on low.
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$416.32
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