For very large confined spaces. Delivers high output for drawing or pushing air. Durable and tough metal housing holds a 6-blade impeller (on standard & EX proof). Designed for easy stacking for multiple blower use. Standard 16" blower has 1/2 hp motor. High output blower has 2 hp blower with efficient 3-blade impeller. Explosion-proof blower includes explosion-proof UL/CSA listed, single phase motor and NEMA rated 115 V plug. Meets Class I, Division I, Group D hazardous location requirements. Ships Direct F.O.B. Mfg.