Fantech 2VLD18B1 Exhaust Fans; Blade Size: 18; Drive Type: Direct; Blade Size: 18 in; Type of Enclosure: TEFC; CFM: 2500; Amperage Rating: 3.9; Rough Opening Width: 22 in; Rough Opening Height: 22 in; Amperage: 3.9 A; Maximum Rpm: 1150 RPM; Horsepowe