The industrial-grade commercial wall exhaust fan features black powder-coated steel construction and self-closing louvres that prevent reverse airflow, which comes with gravity shutters. It is suitable for industrial, commercial, or domestic applications. The fan can extract heat, air, or dust or ventilate a space like a factory or garage. It is designed to extract large volumes of air with relatively low noise. It is easy to install and comes with a 45W motor ready to be hardwired by an electrician.
The image to the right shows the fan from the side with its louvres shut. As you can see, the fan has a cage covering the blade.