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Enclosure Ventilation Fan Sizer

Cooling airflow for control panels: CFM from internal watts and allowed rise, with filtered-fan derate. 4 inputs, 3 outputs with grouped results.

Inputs

Heat load

From the panel heat-loss calculator.

Inside minus outside air temperature.

Inlet filter?

Filters cut effective airflow; size up 25%.

Biggest filtered fan you will fit; above this means AC.

Result

Required with filter
Waiting for calculation.
Base airflow
Waiting for calculation.
Needs air conditioner (1=yes)
Waiting for calculation.
Screening calculation only. Verify against NEC articles cited on the page and the equipment nameplate; the authority having jurisdiction governs.

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Stored inductive energy, braking dump energy, average dump power and resistor sizing hint. 5 inputs, 4 outputs with grouped results.

Outputs: Stored coil energy · Energy per stop · Average dump power

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Six heat sources, natural dissipation from enclosure area, cooling need and fan/air-con decision. 8 inputs, 5 outputs with grouped results.

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Resistor Power Dissipation

Dissipation from any two of V/I/R, 2x rating guide, temperature rise estimate and annual waste. 6 inputs, 5 outputs with grouped results.

Outputs: Dissipation (V x I) · Cross-check (I2R) · Min rated (2x rule)

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Workspace

Keep the assumptions with the result.

Save this calculation to return to the inputs, result, and report from your private workspace.

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