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Compressed air or saturated steam is the power source for these air movers (air horns). They operate on the venturi principle whereby you take a small volume of high velocity air from a compressed air source through the casting and out the nozzle jets. This creates a venturi action that induces large volumes of low velocity air moving through the venturi and out the air diffuser. Overall length: 44.00", Diameter of housing: 13.00", Diameter of base: 11.16", Bolt circle diameter: 10.28", Base slot: 0.43", Intake valve connection: 1" NPT