The Aeroflow Performance universal brushless electric fans are suitable for both A/C condenser, radiator cooling or can be mounted to any fluid cooler. These fans provide an increase in air flow with less amp draw, compared to our regular electric fans. This makes it better for air conditioning performance, cooler engine running, and increased engine power with less load on the electrical system. This brushless fan does not require any specific controllers and just a simple positive (+) and negative (-) wiring with an appropriate automotive relay. It will not work with any variable speed fan controllers but on/off thermostat controllers will work which are sold separately. Designed for 12-volt systems only with a soft start ramp up feature which prevents amp spikes with a fan turning on and off. NOTE: This is strictly a puller fan and is not reversible. All Fans are 3" (80mm) thick including motor.