17-1/4" Diameter x 2-1/28" deep, heavy-duty flex fan offers a unique design that allows fan blades to flatten out when sufficient airflow is present, thereby avoiding engine overload and boosting your mileage and horsepower.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to review part number D17617. This is the Derale 17 inch stainless steel flex fan. This is a belt-driven reverse rotation design fan. This heavy duty flex fan will offer you a unique design that will allow the fan blades to flatten out when sufficient air flow is present. That will avoid your engine overloading and boost your mileage and your horsepower. It will also improve your overall performance of the engine.
It will pull more air at the lower speeds than your factory fan because of the large surface area. As I said when you get into the higher RPMs, these stainless steel blades right here will flatten out at the higher RPMs. The reason they do that is you don't need as much air flow used because the vehicle speed alone will offer you sufficient air flow. It has a heavy duty hub center and these durable reinforced as you can see stainless steel blades. The reinforced blade construction will help extend the fan life. This part is made in the USA.
As I mentioned, it is a reverse rotation design. It is designed to go counterclockwise just like that. It is rated up to 10,000 RPMs. Now dimension on it, this is rated as a 17 inch fan but the actual tip to tip dimension is 17 1/4 inches. Now the depth of the fan is going to be 2 1/2 inches deep.
It does have a center pilot hole right here with a 5/8 inch diameter. The four mounting holes as you can see, they're elongated. It gives you an adjustability to mount onto the flange you're using anywheres from the smallest 1 3/4 inch mounting holes out to the 2 1/4 inch mounting holes. You could have adjustability when mounting this onto your flange. This does come with a one-year warranty. That should do it for the review on part number D17617, the Derale 17 inch stainless steel fan and the belt-driven and reverse rotation design.
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Perfect!!! Exactly what I wanted at a good price and delivery. Would certainly buy from these folks again.
excellent price for reverse rotation flex fan.
this fan works and fits perfectly and it is the only one I found to be a reverse rotating
model. etrailer was a great help in finding the fan
I bought this Derale flex fan for a 1999 F350 I use for plowing. I prefer to leave the plow mounted all winter, since it's such a pain to remount in a hurry for each storm. But the stock Ford fan clutch was too weak to drive the fan with the plow mounted, and quickly burned out - after which I couldn't drive more than 30mph with the plow mounted without overheating. After a while I drilled a pin through the clutch to get a hard drive for the fan which solved the overheating problem but replaced it with a belt slippage problem - couldn't rev the engine over 3000 rpm without slipping. Finally last year I replaced the stock fan with the Derale flex fan. PROBLEM SOLVED. Now I can leave the plow on all winter, drive 75 mph without overheating, and run the engine to redline without belt slippage. PERFECT!
Quality fan, easy install. This replaced my stock fan on my 1990 Chevy pickup with 5.0 V8. I plow with this truck, so I needed a fan that moves a lot of air at slow road speeds, and this one does. I know it works because my coolant temp gage is a bit lower. Not excessively loud either.
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