Zirgo's airflow requirements are measured in fCFM (forced cubic feet per minute) and represent the volume of air the fan can move in one minute. Higher airflow is generally required for larger engines and high-performance vehicles.

Consult your vehicle’s manufacturer specifications or call our dedicated technical support line for expert advice on determining the recommended fan size for your vehicle.

Consider the following minimum fCFM ratings for basic engines:

• • 1,250 fCFM for a 4-cylinder
• • 2,000 fCFM for a 6-cylinder
• • 2,500 fCFM for a 8-cylinder
• • 2,800 fCFM or more for engines that are 5.0-liter (302 cubic inches) or larger

When considering a fan for your vehicle’s radiator, it is important to consider the space around it.

Taking accurate measurements of the area is crucial to ensure that you select a fan that fits appropriately and does not obstruct other essential components. Measure the radiator and the distance between the radiator and engine components. Measure the radiator core (the finned surface between the two tanks). You’ll want to select one of our fans that covers as much of this space as possible.

In some cases, you may be better off with a dual fan because the shroud will pull air through a larger area of the radiator than a single fan. 

The size of a radiator fan is typically measured in inches and refers to the diameter of the fan blades. The fan size should be proportional to the size of your radiator for efficient cooling. A fan that is too small may not provide adequate airflow, while a fan that is too large may cause clearance issues or unnecessary power consumption. It is recommended to have at least 70% of the radiator core covered by the fan shroud.

There are 2 styles of blades to choose from:

• Straight Flat Blades - these blades are flat & balanced which provides higher performance (airflow) than S-blades
• Curved S-Blades - these blades are slightly thinner in depth than straight blades which allows them to fit in tighter spaces. An S-Blade design also has quieter operation.

Your vehicle - One of the most important factors is the size and power of your engine. A larger engine will generate more heat and thus require more effective cooling. Additionally, your vehicle type (car, truck, SUV) can also impact cooling needs. For example, an SUV may require a more robust cooling system due to its larger size and weight.

Finally, any modifications or aftermarket parts you’ve added to your vehicle can also impact its cooling needs. Consider these factors and make necessary adjustments to ensure your car stays cool and runs smoothly.