Good when you don't have room to mount an exhaust fan inside your facility, these fans attach to openings in outside walls. Use them to draw stagnant and humid air out of a room or area.

Direct-drive fans have fewer moving parts than belt-drive fans, so they’re easier to maintain.

Fans with an open dripproof motor enclosure should be used in clean, dry, and indoor locations. You can use these fans with or without duct. To use them with duct, you'll need an angle ring (not included).

Note: Airflow depends on the resistance created by louvers, filters, and ductwork in your system. This resistance, known as static pressure (SP), is measured in inches of water.

Grilles (sold separately) have fixed blades.

Louvers are gravity operated. The blades open when air flows and close when it stops, preventing backdrafts.