Canarm AX 18-In. Explosion Proof Wall Mount Shutter Exhaust Fan | Sylvane
EXHAUST FAN Commercial - Direct Drive - 20" - 1/4 Hp - 115V - 1 Spd - 3,200 CFM | eBay
Amazon.com: Canarm Belt Drive Wall Exhaust Fan with Cabinet, Back Guard and Shutter - 48in. 27,422 CFM, Single-Phase, Model Number XB48CBS10300 : Canarm: Tools & Home Improvement