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  1. Radiator Fans
  2. Derale
  3. 4000 CFM
  4. 27 Inch Diameter
  5. Electric Fans
  6. High-Output Fan
Derale 27" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly - 4,000 CFM

Derale 27" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly - 4,000 CFM

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Radiator Fans
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Shipping Weight: 21 lbs
D16837 - High-Output Fan Derale Radiator Fans
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27" Wide x 18" tall x 3-3/4" deep, high-powered, dual, electric fan assembly will boost your vehicle's fuel economy and increase both torque and horsepower. Lowest Prices for the best radiator fans from Derale. Derale 27" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly - 4,000 CFM part number D16837 can be ordered online at or call 1-833-496-1390 for expert service.
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Derale Radiator Fans

  • 4000 CFM
  • 27 Inch Diameter
  • Electric Fans
  • High-Output Fan
  • Derale

27" Wide x 18" tall x 3-3/4" deep, high-powered, dual, electric fan assembly will boost your vehicle's fuel economy and increase both torque and horsepower.


  • Increases fuel economy, horsepower and torque
  • Improves overall performance
  • Has patented, ultra-quiet, skewed-blade design
  • Offers consistent airflow with stator flow directors
  • Can be mounted in various locations behind the radiator
    • Puller applications only
  • Designed with durable, powder coated metal shroud
  • Includes mounting brackets with 5" adjustment range and all necessary hardware
  • Made in USA


  • Overall dimensions: 27" wide x 18" tall x 4" deep
  • Mounting dimensions: 24-3/4" wide x 16-1/2" tall x 2-3/4" deep
  • Maximum cubic feet per minute: 4,000
  • Power draw: 24.8 amps per fan
  • High-output motors: 265 watts
  • 1-Year warranty

Whereas belt-driven fans use up power from the engine to turn, electric fans do not, thus removing any unnecessary load and increasing both fuel economy and horsepower. In addition, you do not have to worry about an electric fan's slowing down at low RPM, as many belt-driven fans do, so you are guaranteed sufficient airflow regardless of the vehicle speed.

While this assembly is intended for primary cooling and should, therefore, provide enough CFM to replace your vehicle's factory fan, you will still need to determine the CFM requirements for your engine before making your purchase. And remember, engines that have been modified or vehicles often used for towing may require additional CFM. There is no limit to the number of fans you can install, as long they all fit appropriately and are mounted on the same side of your radiator so that they do not cancel each other out.

Two types of turn-on sources are available for this fan. The Derale Lighted On/Off Switch for Electric Fans (D16740) allows for manual control of your fan so that you can choose when to turn it on and off. Thermostatic controls, on the other hand, send a signal to the fan, directing it to shut off when fluid temperatures reach an appropriate level, thus saving power. Once the temperature climbs again and additional cooling is needed, the fan is automatically turned back on. Thermostat switches can be single-stage with pre-set temperatures - D16735, D16738, D16739, D16720 and D16721 - or adjustable - D16778 and D16779.


D16837 Derale High-Output Dual RAD Fan Kit

Item # D16837


See what our Experts say about this Derale Radiator Fans

  • Thermostat Recommendation for Use with Derale 27" Dual High-Output, Electric Radiator Fan
    The Derale 27" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly # D16837 that you referenced does not come with wiring but with a thermostat kit like the # D16789 you'd be set. This can control both of the fans and wire in to the AC system too if needed.
    view full answer...
  • What Is Needed To Install the Derale Electric Radiator Fans
    I do have everything that you need to use the Derale 27" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly part # D16837 but it does not come with any of the wiring or relays needed to power the fans as Derale stopped including them. It simply comes with the fans, shroud, and mounting bracket/hardware. In order to wire the fan up I recommend using either the PWM Fan Controller part # D16795 or the Derale Dual-Fan Adjustable Fan-Control part # D16788. The main difference between...
    view full answer...

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Info for this part was:

Employee DeAnne T
Written by:
DeAnne T
Employee Jameson C
Expert Research:
Jameson C
Employee Brian B
Updated by:
Brian B
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Updated by:
Daron K
Employee Jessie B
Updated by:
Jessie B

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