Upgrade your ventilator with Broan-NuTone’s Automatic Shutters! These shutters are designed for Broan-NuTone-NuTone models 353 and 35316. They allow more air movement than conventional stationary attic louvers to ensure the superior airflow. The counter-balanced aluminum vanes open automatically when the ventilator is turned on and close when the fan stops for your convenience. The flange fits flush against the outside wall for a neat, smooth appearance. This shutter is reinforced for strength and provides tight weather closure for reliable, lasting use. The Broan-NuTone’s Automatic Shutters measures 16.75″ x 2.75″ x 16.75″, perfect for your home.