Broan - Too often, attic ventilation is overlooked, not to mention ignored as a place for energy savings. Thats where Broan solutions make sense. Consider this: air trapped in your attic can easily reach 150˚ or more. With Broan ventilation solutions, its still a full 60˚ cooler in the attic on a 90˚ day.
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Broan - Automatic Shutter Model 433 Allows more air movement than conventional stationary attic louvers. Counter-balanced aluminum vanes open automatically when ventilator is turned on, close when fan stops. Flange fits flush against outside wall for neat, smooth appearance. Reinforced for strength; provides weather tight closure.
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