Flex Fans

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Engine Flex Fan
Engine Flex Fan
Engine Flex Fan
Engine Flex Fan

Flex fans are flexible fan blades on a fan, that change shapes depending on the RPM's the vehicle is at. Flex fan blades are a lighter and more flexible and are made out of aluminum or stainless steel. They are made from these materials so that the blades can change shape when the fan starts spinning at higher RPM’s. Normal vehicle fans are a heavy and sturdy blade that is constantly spinning at the same speed so long as the engine is on. What makes a flex fan so much more efficient is that at higher RPM, the blades will flatten out which reduces drag and enables almost zero resistance, compared to all the resistance caused with stationary fan blades. This decrease in drag can help increase fuel economy and horsepower to the engine. Once the vehicle slows down again and the RPM’s go down the fan blades will return to their regular shape to provide normal air flow to the engine. Flex fans should be installed with at least 1” of clearance from the radiator to allow for the blade to flex and for driveline / chassis movement. Before you purchase a flex fan make sure you know which way the blade needs to turn, not all vehicles spin the blade in the same direction. A general rule of thumb is that “V” belt systems turn the blade the clockwise which is commonly referred to as the standard rotation and serpentine belts spin the blade counter clockwise which is referred to as reverse rotation. To be sure though it is recommended to open your hood and start the car and watch which way the blade turns. Do not ever touch a moving part in the engine compartment, you can be seriously injured.

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