1. Radiator Fans
  2. Derale
  3. 26 Inch Diameter
  4. Electric Fans
  5. 4000 CFM
  6. High-Output Fan
Derale 25-5/8" Dual High-Output, Electric Radiator Fan w/ Aluminum Shroud and Vents - 4,000 CFM

Derale 25-5/8" Dual High-Output, Electric Radiator Fan w/ Aluminum Shroud and Vents - 4,000 CFM

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Derale 25-5/8" Dual High-Output, Electric Radiator Fan w/ Aluminum Shroud and Vents - 4,000 CFM 4000 CFM D16826
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25-5/8" Wide x 17-1/8" tall x 4" deep, high-powered, dual, electric fan assembly will boost your vehicle's fuel economy and increase torque and horsepower. Aluminum shroud is rustproof and can be painted, polished or anodized. Lowest Prices for the best radiator fans from Derale. Derale 25-5/8" Dual High-Output, Electric Radiator Fan w/ Aluminum Shroud and Vents - 4,000 CFM part number D16826 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Derale Radiator Fans

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

25-5/8" Wide x 17-1/8" tall x 4" deep, high-powered, dual, electric fan assembly will boost your vehicle's fuel economy and increase torque and horsepower. Aluminum shroud is rustproof and can be painted, polished or anodized.


  • Increases fuel economy, horsepower and torque
  • Improves overall performance
  • Has patented, ultra-quiet, skewed-blade design
  • Designed with durable, rustproof, aluminum shroud that can be painted, polished or anodized to fit your application
  • Effectively vents air and pressure in the engine compartment with built-in relief flaps
  • Can be mounted in various locations behind the radiator
    • Puller applications only
  • Includes mounting brackets, hardware and installation instructions
  • Made in USA


  • Overall dimensions: 25-5/8" wide x 17-1/8" tall x 4" deep
  • Mounting dimensions: 17-3/8" - 23-3/8" wide x 9-5/8" - 15-5/8" tall x 2-3/4" deep
  • Maximum cubic feet per minute: 4,000
  • Power draw: 24.8 amps per fan
  • High-output motors: 300 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 - D16788 and D16789.


16826 Derale High-Output Dual RAD Fans with Integrated Air Vents - Aluminum Shroud

Item # D16826

Installation Details D16826 Installation instructions


Ask the Experts about this Derale Radiator Fans

  • 4,000 CFM Radiator Fan and Shroud Recommendation for Trans Am with LS3 Engine
    The Derale 25-5/8" Dual High-Output, Electric Radiator Fan w/ Aluminum Shroud and Vents # D16826 would be a great choice for a fan setup for your 2001 Pontiac Trans Am with a LS3 engine. For a thermostatic controller for the fan setup you would want the # D16788. This setup will flow 4,000 CFM which should do well to cool your modified LS3 engine that I am jealous of. I have a heads/cam LS1 in my 1998 Trans Am, but few engines have the potential as the LS3.
    view full answer...
  • Fan Recommendation for a 1979 Ford F150 with a 460 Cubic Inch Engine
    As long as you have the clearance, the Derale Radiator Fans # D16826 that you referenced would be a good choice for your 1979 Ford with a 460 cubic inch motor. This unit can pull up to 4,000 cfm and should work well for cooling your vehicle. I attached a picture that shows the dimensions of this setup for you to compare with the size of your radiator. You might also be interested in purchasing a Derale Dual-Fan Adjustable Fan-Control Thermostat # D16789 to allow you to select when...
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  • Are Extra Parts Needed When Installing Derale Radiator Fan and Thermostat on 1967 El Camino
    I spoke with my technical contact at Derale and he assured me that when you install the Derale Radiator Fan # D16826 along with the Derale Adjustable Thermostat # D16789 on your 1967 El Camino you will not need any additional parts for a successful installation. You do not need any additional relays.There is a 50 amp circuit breaker included in the thermostat kit.
    view full answer...
  • Fit of Derale # D16826 Electric Fan on 2007 Nissan Armada
    The Derale Dual High-Output Electric Radiator fan you mentioned, part # D16826 is not a vehicle specific item. It will work with your vehicle if there's enough room to accommodate its 25-5/8 inches long x 17-1/8 inches tall x 3-1/2 inches deep size. A fan control thermostat like part # D16788 would also be needed.
    view full answer...
  • 4,000 CFM Fan Kit Recommendation for 1974 Chevy Corvette with 502 Cubic Inch Big Block
    The shallowest fan setup we have that can move 4,000 CFM of air would be the Derale High Output Fan and Shroud part # D16928 as it measures only 3-1/4 inches deep. Height and width though are 28-5/8 inchs and 13-7/8 inches. If you need a smaller height and width but can get by with a slightly deeper setup we have the Derale part # D16826 as well. This measures 25-5/8 inche wide x 17-1/8 inches tall x 4 inches deep. Having either fan setup as a puller instead of a pusher will get...
    view full answer...
  • Recommendations to Help Prevent a 1965 Lincoln Continental From Overheating at Idle
    Going to a larger aluminum radiator will drastically help your 1965 Lincoln Continental stay cool. If you wanted to try a different fan setup I would recommend you get rid of the mechanical fan you have that pulls air through the radiator and go with an electric fan setup with a shroud like the # D16826. This will pull a ton more air through your radiator than a mechanical fan at idle so it should work very well for you. Fans that pull air through the radiator are much more efficient...
    view full answer...
  • Dual Fan and Shroud Setup Recommendation for a 1993 Jeep Wrangler
    The best solution I could provide for you would be the Derale Dual High Output Fan with Shroud part # D16826. This setup will pull 4,000 cfm which should help keep your engine coolant from overheating. A mechanical fan can pull a great deal of air, but that's only when the engine is revved up high. An electric fan can pull it's max amount of cfm regardless of engine RPM so it will cool better than a mechanical fan.
    view full answer...
  • Total Depth of Derale Dual HO Electric Radiator Fan w Aluminum Shroud # D16825 and # D16927
    The Derale 25-5/8" Dual High-Output, Electric Radiator Fan w/ Aluminum Shroud # D16825 that you referenced has a depth of 3-1/2 inches. The part # D16826 that you looked at also shares this same depth. The Derale 26" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly # D16927 that you also referenced has a depth of 3-3/4 inches. I attached an FAQ article that you might find helpful on electric fans to the right as well.
    view full answer...

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