***** Please Read Prior to Purchase *****

• Automatic Shutter
• Model 433
• Automatic Shutter
• •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.