The Derale 15 inch High Performance Flex Fan is a belt-driven mechanical cooling fan with flexible stainless steel blades and a black-finished hub. The flexible blades flatten out as engine speed rises, which reduces the power the fan draws and keeps noise down at higher RPM while still moving strong air at idle and low speed. This is the 15 inch standard-rotation (clockwise) version.
Specifications:
- Type: belt-driven high performance flex fan
- Diameter: 15 in
- Blade material: stainless steel
- Rotation: standard rotation (clockwise)
- Hub finish: black
- Part number: 19115
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 19115?
Standard rotation, which turns clockwise as viewed from the front. Match the rotation to your water pump.
What is the fan diameter?
15 inches, with stainless steel blades and a black hub. Confirm clearance between the water pump flange and the radiator.

