A welding machine power supply has two circuits for cooling air. A primary circuit comprises a magnetics chamber and a second chamber. A fan between the magnetics and second chambers draws atmospheric air through one end panel into the magnetics chamber and blows it through the second chamber. The second...http://www.google.fr/patents/US6489591?utm_source=gb-gplus-shareBrevet US6489591 - Cooling air circuits for welding machine
