For inflating double layered greenhouse plastic. 3 Bolt and 4 bolt blowers are standard, 120VAC, pre-wired with 8 ft cord.Mounting bracket required to attach to greenhouse bow.The 3-bolt blower is recommended for inflating plastic on greenhouses up to 1500 square feet. 60 CFM, 0.15A (18w).The 4-bolt blower is recommended for inflating plastic on greenhouses above 1500 square feet. 148 CFM, 0.5A (60w).
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