How to Design And Build A High-Performance Cooling System
Spal makes this slick pulse-width modulating fan controller, which is programmable to control either single or dual electric-fan speeds. The first level will spin the fan at half-speed. At the second trigger point, the fan will spin at 100 percent. It can also control two fans with the second on when the A/C is activated. This is done with simple dipswitches on the side of the controller. View Related Article
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