Compressed air or saturated steam is the power source for these air movers. They use small volumes of high pressure air (from the compressed air source) which is ejected through the nozzle jets which are machined into the casing. The high pressure air creates a low pressure zone that induces large volumes of ambient air through the base and out the air diffuser (horn) of the air mover. The use of a 1″ hose is recommended for the compressed air supply. The size of the compressor can be determined by using the chart which shows air consumed at various inlet pressures. Operate the air mover on air or steam regulated to a maximum 150 psi.