The Derale 66821 powerpack combines a high-output 17" two-speed electric fan with an engineered aluminum shroud and a digital PWM fan controller. It is built for primary engine cooling and works well on thick, tight-fin radiator cores where airflow is hard to pull. The fan moves 2400 CFM on high and 1800 CFM on low using a patented ultra-quiet skewed blade, and the PWM controller varies fan speed from 0 to 100 percent for smooth, efficient operation. The raw aluminum shroud can be left as-is, polished, painted, or anodized.
Specifications:
- Fan: 17" high output, two-speed, 265-watt motor
- Airflow: 2400 CFM (high) / 1800 CFM (low)
- Amp draw: 23.5 A (high) / 17.4 A (low)
- Configuration: puller (engine side) only
- Shroud: aluminum, 20-3/4" W x 17-5/8" H x 3" overall depth
- PWM controller: 0-100% speed, rated up to 70 A, soft start, 20-second shutdown timer, auto-resetting breaker, A/C override
- Controller components: sensor 16757, controller 16797, fan 16917
- Included: mounting brackets and complete mounting hardware
- Part number: 66821
FAQ
What is the Derale 66821 powerpack for?
It is a primary cooling fan and aluminum shroud assembly with a PWM controller, suited to thick, tight-fin radiator cores.
How much air does it move?
The 17" two-speed fan moves 2400 CFM on high and 1800 CFM on low.
What does the PWM controller do?
It varies fan speed from 0 to 100 percent, is rated up to 70 amps, and includes soft start, a shutdown timer, an auto-resetting breaker, and A/C override.
Can it be used as a pusher?
No, this powerpack is for puller (engine side) applications only.
