Abstract: A breather cap having a foam filter element and means to permit vapors from the crankcase, manifold or the like to which the cap is attached to pass freely in and out of the cap and between the cap and atmosphere. The invention cap includes a twist-in mounting feature, and an improved assembly method.

Abstract: A pair of anti-parallel connected NPN transistors function in push-pull manner to regulate alternately current power applied via the transistors to an induction motor driving a fan providing a generally constant motor load. As the transistors apply more or less current to the motor by varying the amount of line voltage applied thereto, the motor speed varies due to more or less pole slippage. The transistors, while reducing the voltage applied to the motor, generally maintain the sine wave characteristics of the applied voltage to preclude high current spikes and other undesirable transients that could result in conventional motor speed circuits utilizing thyristors that are phase-triggered to vary the half-cycle portions of the applied motor voltage.