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This same J-box for converting 2-120V to 240V is shown in the Hypervac duct cleaner vacuum site-on another thread here.It allows you to run their 240V portable duct vacuum from two opposing 120V outlets.Since the Hypervac 240V unit has a Variable Speed Drive on its motor can be set to a speed that won't blow breakers or fuses.And the motor starts gently and graduately.3 Hp.
