Get complete control of your engine temperature Derale performance has integrated their high performing shrouded power packs with the ultimate fan controller.  using a high output Electric fan incorporated into an engineered shroud, this power pack can conquer even the most difficult cooling conditions.  this unit features a aluminum shroud measuring 18-3/4" wide by 17-5/8"  top to bottom and is only 3" in overall depth to offer a precision fit. This 17" high output two speed fan is one of the best in our line-up offering up to 2400 CFM and is specifically designed to thrive on thick, tight fin radiator cores.