... AVR·Efficient one-way rotary fan·Fulcrum optional single or double, single fulcrum optional specifications of the transition then sets ... requirements·H-class insulation standards for grading·Diode-side spin round and coupling bolts simple installation and ... 60HZ 1800r/minMore than can be produced with bell, single, double fulcrum optional, brushless excitation, AVR automatic voltage regulator, ...