Get complete control of your engine temperature! Derale Performance has combined their high-performing shrouded Powerpacks with the ultimate fan controller. Using a brushless electric fan incorporated into an engineered shroud, this Powerpack can conquer even the most difficult cooling conditions. This unit features an Aluminum shroud measuring 21" wide by 16 3/4" top to bottom and is only 3" in overall depth to offer a precision fit. This 17" brushless elesctric fan is one of the best in our line-up offering up to 2800 CFM and is specifically designed to thrive on thick, tight fin radiator cores. Now add the PWM Fan Controller with built-in soft start technology. The controller utilizes Pulse Width Modulation to constantly adjust electric fan speeds from 0-100%, to maintain 185°F temperature. No more reacting to the engine temps, you can control it! This allows the 17” brushless electric fan to operate at the percentage needed, instead of 100% all the time, therefore increasing component life and eliminating amperage spikes.