Automatic Shutter (use with Models 353 and 35316 — Sold separately).

Model: 433

Automatic Shutter (use with Models 353 and 35316 — Sold separately).

  • 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