Broan 433 Automatic Shutter Automatic Shutter for Attic Fans

Broan 433 Automatic Shutter Automatic Shutter for Attic Fans Description

Broan, 433, Automatic Shutter, Accessory Automatic Shutter - Model 433Allows More Air Movement Than Conventional Stationary Attic LouversCounter-Balanced Aluminum Vanes Open Automatically When Ventilator Is Turned On, Close When Fan StopsFlange Fits Flush Against Outside Wall For Neat, Smooth AppearanceReinforced For Strength; Provides Weather Tight Closure

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