Derale Performance Engine Cooling Fan Assembly

Derale Performance Engine Cooling Fan Assemblies: Built to Keep Temperatures in Check

When your engine is working hard — whether you're crawling through traffic, towing heavy loads, or pushing a high-performance build to its limits — the cooling fan assembly is the last line of defense between optimal operating temperature and a costly overheating event. Derale Performance, a Los Angeles-based cooling specialist with roots dating back to 1975, has built its reputation specifically around solving this problem. Their engine cooling fan assemblies represent decades of engineering refinement, and today the lineup spans everything from compact single-fan units to heavy-duty dual-fan Powerpack setups capable of moving massive volumes of air.

A Fan Lineup Engineered for Every Application

Derale's engine cooling fan assembly catalog is organized around several distinct product families, each targeting a different performance tier and installation scenario.

• High Output (H.O.) Single RAD Fan Series: Compact and versatile, these assemblies — such as the popular 12" High Output Single RAD — can function as either a pusher or a puller fan simply by flipping the mounting brackets, without reversing the motor or changing the blade direction. They're a go-to choice for builds where under-hood space is tight.
• High Output Dual RAD Fan Assemblies: For applications that demand maximum airflow, Derale's dual-fan kits pair high-output motors — including 265-watt Bosch units on select models — with injection-molded shrouds featuring pressure relief vents and stator flow directors to produce up to 4,000 CFM.
• Shrouded Powerpack Series (Single, Dual, and Triple): The Powerpack line integrates the fan and aluminum shroud into one engineered assembly. The fully welded aluminum shroud stays slim — some units measure as little as 2-13/16" in depth — making them ideal for builds where radiator-to-engine clearance is critical. The natural aluminum finish can be polished, anodized, or painted to match any build aesthetic.
• Brushless Dual Powerpack: Derale's brushless fan assemblies represent the top of the performance ladder. The dual 12" brushless Powerpack is specifically designed to thrive on thick, tight-fin radiator cores and delivers up to 4,400 CFM — all in one of the most compact footprints in its class — with a built-in PWM controller and soft-start technology included.
• PWM Powerpack Assemblies: These units incorporate Derale's Pulse Width Modulation (PWM) technology directly into the fan assembly. Rather than a simple on/off operation, the PWM system continuously varies fan speed in proportion to coolant temperature, keeping engine temps more consistent while extending fan motor life and reducing the load on the alternator and battery.

Why the Shroud Makes All the Difference

One of Derale's core engineering principles is that a shrouded fan assembly will always outperform a bare fan. By housing the fan within an engineered shroud, airflow is drawn evenly across the entire radiator core rather than just the area directly in front of the fan blades. This means more effective heat rejection from the same motor and blade combination. Derale's aluminum shrouds are precision-sized to common radiator core dimensions, making fitment straightforward on a wide variety of domestic and import applications, including popular diesel platforms like the Ford Powerstroke, GM Duramax, and Dodge Ram Cummins.

Primary Cooling Without Sacrificing Power

One key advantage of switching to a Derale electric fan assembly is the elimination of the engine-driven mechanical fan. Belt-driven fans draw power continuously from the engine regardless of whether cooling is needed, sapping horsepower and fuel economy. Derale's electric assemblies only consume power when actively cooling, freeing up engine output and improving efficiency — a meaningful benefit for both daily drivers and performance builds alike.

Whether you're upgrading a classic muscle car, modernizing a street rod, or adding thermal protection to a heavy-duty diesel truck, browse the full selection of Derale Performance engine cooling fan assemblies to find the right unit for your application.