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Radiator Fans - 20 Inch Diameter

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Radiator Fans with 20 Inch Diameter for projects

Working on a street rod or heavy-duty truck? 20 inch diameter radiator fans balance coverage with shroud fit for builds that need strong cooling area. Pick rigid blades for maximum airflow at higher RPMs, knowing they add more drag, or go flex where blades flatten at speed and are slightly deeper than rigid styles. Measure your space and run a shroud to funnel air, keeping clearances in check for best results.
Not effectively. Even though the blades could spin either way, a pulley-mounted 20 Inch Diameter fan is intended to pull through the radiator, not push. Set it up as a puller with a shroud to direct airflow. Without a shroud, cooling gains may be minimal.
Facing the engine from in front of the vehicle, standard rotation is clockwise. Confirm the blade orientation and any rotation markings on the fan. Verify that the shroud is centered and that the blades clear all sides before running the engine.
A rigid 20 Inch Diameter fan moves more air at higher RPMs than a flex fan. A flex fan's blades flatten at high RPMs to cut drag, while a rigid fan keeps its blade profile and airflow but can add engine drag and a bit more noise. Check depth and shroud clearance since flex fans can be deeper than rigid. Use a shroud to funnel airflow and improve cooling.
Yes, many 20 Inch Diameter fans are universal-fit for clutch or hub setups. Measure the space and verify the bolt pattern and pilot bore match your clutch. If the hub fit is tight, carefully dress the bore to fit. Position the shroud for blade clearance and spin by hand to confirm nothing contacts.