The Derale 17 inch Heavy Duty Flex Fan is a belt driven mechanical cooling fan with six reinforced stainless steel blades and a thick powder coated black steel hub. The flexible blades have a large surface area to pull strong airflow at idle and low speed, then flatten as engine speed rises to reduce the power the fan draws and keep noise down. It is a standard rotation fan rated up to 10,000 RPM.
Specifications:
- Type: Belt driven heavy duty flex fan
- Diameter: 17-1/4 in
- Blade material: Stainless steel, reinforced
- Blade count: 6
- Rotation: Standard (clockwise)
- Hub finish: Powder coated black steel
- Maximum speed: 10,000 RPM
- Flange bolt spacing: 1-3/4 in to 2-1/4 in
- Part number: 17017
FAQ
What is a flex fan?
A flex fan uses flexible blades that flatten as RPM increases, reducing drag and noise at speed while still pulling strong airflow at idle and low speed.
Which rotation is the Derale 17017?
Standard rotation, which turns clockwise as viewed from the front. Match the rotation to your water pump.
What is the fan diameter?
It measures 17-1/4 in with six reinforced stainless steel blades and a black powder coated steel hub.
How fast can it spin?
It is rated up to 10,000 RPM. Confirm adequate clearance between the water pump flange and the radiator before installation.

