Duro flow rotary lobe type pressure blower model 4506vt, serial # r95363. Features 40 horsepower tefc motor by u. S. Motors belt driving blower @ 1770 rpm via three shiv belt and pulley, 230/460/3 ph voltage & inlet and outlet silencer, mounted on stationary tubular floor frame, blower operates as positive or negitive blower, rated for up to 16" hg when used as vacuum blower. Formerly used as dust collection blower in food industry.