This blower is used for inflating two layers of polyethylene on a greenhouse. The air space between the two layers provides the greenhouse with insulation. Fan has an adjustable inlet for obtaining proper operating pressure and can be used to inflate the plastic on greenhouses up to 30' x 100'. 4" diameter mounting flange. Requires 110/120 volt electricity. Blower comes with a 5' power cord and includes a 1/60HP sealed ball bearing motor with thermal protection. The power usage is 0.25 amps with a 60 CFM max output.