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

Derale Radiator Fans - D16826

25-5/8" Wide x 17-1/8" tall x 3-1/2" 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.

Features:

• 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

Specs:

• Overall dimensions: 25-5/8" wide x 17-1/8" tall x 3-1/2" deep
• Mounting dimensions: 15-5/8" - 22-5/8" wide x 8-1/8" - 15-5/8" tall x 2" 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 - D16788 and D16789.

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

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• 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 the fans
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