The axial fan 230 vac 340 mh l x w x h 173 x 150 x 51 mm sepa ka1725ha2bmt is high quality ball bearing powerful exhaust for extreme demands it has permanent electronic protection against blocking and thermal overloading other features of this fan are extremely rugged and dimensionally stable aluminium casing magnesium blades as well as the ball bearings made of special steel clockwise rotation