Calculate cooling fan and shroud dimensions for proper radiator airflow coverage and static pressure at idle.
Input Parameters
Results
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Radiator Face Area
sq in
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Min Fan Diameter
in
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Shroud Coverage
%
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Est. Static Pressure
in H2O
Note: Shroud should cover 70%+ of radiator for effective low-speed cooling. Without a shroud, fan may only cool 30% of the core. 1-inch gap between fan and radiator is optimal.
Reference
Radiator Area = Height × Width
Fan Area Needed = Rad Area × 0.7 / N_fans
Fan Diameter = 2 × √(Area / π)
Shroud Coverage = Fan Area / Rad Area × 100
Target coverage: ≥70% of radiator face