2.5 HP "Regenair" high volume regenerative blower by Gast Mfg. Made in the USA. Used in spa/hot tub, pond aeration, plasma cutting, all kinds of applications. The Gast slogan is "think about what you can do with air then call Gast" Move a lot of air so fast it becomes hot, and create high volume vacuum. These retail for big bucks. 110/220 volt. 2 available. $150 each.