Motor Cage type capacitor structure external rotor motor Impeller Impact molding of aluminium alloy plate Allowable environment temperature and humidity range:(under unconcretionary condition) -40ºC ~ +70ºC (temperature) 0% ~ 95% (humidity) Protection Motor Internal with automatic recovery thermal protector Withstand Voltage AC 1,800V , 1 min at 0.5mA, 50/60 Hz Insulation Grade design according to IEC61858 Grade F, Protection Grade IP44