The Derale 19318 is an 18" high performance flex fan with stainless steel blades and a black hub, built for reverse-rotation water pumps found on many serpentine-belt engines. Its flexible stainless blades flatten as engine speed rises to reduce fan drag and noise at higher rpm while still moving strong airflow at idle and low speed. It is a universal mechanical fan for reverse (counterclockwise) rotation applications.
Specifications:
- Type: high performance mechanical flex fan
- Diameter: 18"
- Blade material: stainless steel
- Rotation: reverse (counterclockwise)
- Hub: black
- Mounting: bolts to a reverse-rotation water pump fan flange
- Part number: 19318
FAQ
What is the Derale 19318 fan?
It is an 18" high performance stainless steel flex fan with a black hub for reverse-rotation engines.
What does reverse rotation mean?
It is designed for reverse (counterclockwise) rotation water pumps, common on serpentine-belt engines.
What does a flex fan do?
Its flexible stainless blades flatten at higher rpm to cut fan drag and noise while still moving plenty of air at idle.

