Hertz: 50 Hz & 60Hz. Output Range: 4,190 to 43,500 CFM. Air Flow on Low: 9,100 CFM. Air Flow on High: 13,000 CFM. Industrial Heavy Duty Exhaust Fan with Shutters/Louvers and Wire Blade Guard on Rear. Motors Speeds: 1 & 2 Speed Models (2 Speed Motors Available on 1 Phase Fans, 1/2 Hp and Below).
eBay