Specialty Air Moving Equipment & Components. Off The Shelf Inventory For Shipment. Items & Size Combinations Of Blower Wheels & Fan Blades. Equipped To Fabricate Blower Wheels, Heavy Class II, Size Combinations From 6" To 30" Class I, "AA" Design For Most Applications. Reinforcing Rods, Rings. Extra Heavy Hubs & Large Bores Available. Flexible Air Duct From 3" To 12" Diameter, 8' To 25' Long In Aluminum & Vinyl Heavy Gage Duct Available 3" & 4" Diameter, 8' To 50' Length. Inventory Of Duct & Blower Accessories