I use this unit with my (Mitsubishi E700) in Australia 240v household. And the speed can be adjust from zero to maximun, the motor not.Producing much heat only about 38c celsius in the summer running. Continually for a few days. All the bearings in this unit just been changed with Japanese bearings. Solid construction, all metal parts no aluminium parts are used in the unit. This is the unit that i ues to control the blower from the 240v 50/60hz outlet. Mitsubishi E700 (FR-E720-030-NA Mitsubishi Inverter, VFD, Variable Frequency Drive). I'm not a professional of any field, this is my way to describe things. The item "Centrifugal Fan Blower Dust/Smoke Exhaust Blower Fan" is in sale since Sunday, August 25, 2019. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Hydroponics\Fans, Filters & Environmental Control\Air Ventilation & Extraction". The seller is "rare148" and is located in melbourne. This item can be shipped worldwide.