Broan 433 Automatic Shutter for 353 and 35316 Gable Mount Attic Ventilator

Broan-NuTone 433 Automatic Shutter Since their beginning in 1932, Broan has pioneered many of the product innovations now established as standards of the industry. Today, Broan carries on the commitment to provide the finest products in the industry.Broan-NuTone 433 Automatic Shutter Features: Attic Ventilators, Powered Attic Ventilators Automatic Shutter for Models 353 and 35316 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.