Electrical Room Ventilation Calculator
Exhaust airflow to remove heat from an electrical/switchgear room.
Enter your values
Enter the equipment heat dissipation in kW.
Enter the allowable temperature rise in °F.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Required exhaust airflow
- 3,159 CFM
- Heat load
- 51,180 BTU/hr
- Fan control
- Thermostatically controlled exhaust fan recommended
- Note
- Verify against equipment manufacturer's specific heat rejection data
Quick answer
Electrical and switchgear rooms are ventilated to remove equipment heat gain, typically sized from the heat dissipated by transformers and switchgear divided by the allowable temperature rise.
CFM = heat (BTU/hr) / (1.08 x allowable temp rise)
At a glance
| What it does | Exhaust airflow to remove heat from an electrical/switchgear room. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Equipment heat dissipation, Allowable temperature rise |
| Main output | Required exhaust airflow |
| Formula | CFM = heat (BTU/hr) / (1.08 x allowable temp rise) |
| Cost | Free — no sign-up, no download |
How to use the Electrical Room Ventilation Calculator
- 1Estimate total equipment heat dissipation in kW (from nameplate losses or manufacturer data).
- 2Choose an allowable room temperature rise, often 10-15°F above outdoor/intake air.
- 3Use a thermostatically controlled fan so airflow tracks actual heat load.
Inputs explained
- Equipment heat dissipation(kW)
- Enter the equipment heat dissipation in kW.
- Allowable temperature rise(°F)
- Enter the allowable temperature rise in °F.
Worked example
Using the values the calculator loads with:
Inputs
- Equipment heat dissipation15 kW
- Allowable temperature rise15 °F
Results
- Required exhaust airflow3,159 CFM
- Heat load51,180 BTU/hr
- Fan controlThermostatically controlled exhaust fan recommended
- NoteVerify against equipment manufacturer's specific heat rejection data
Frequently asked questions
Why not just use AC instead of ventilation?
Simple exhaust ventilation is far cheaper where outdoor air is cool enough; AC is reserved for rooms needing tighter temperature control.
Does dust matter for switchgear rooms?
Yes — filter intake air to keep conductive dust off busbars and breakers.
What do I need to enter into the Electrical Room Ventilation Calculator?
Just 2 values: equipment heat dissipation, allowable temperature rise. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Electrical Room Ventilation Calculator work out the answer?
Electrical and switchgear rooms are ventilated to remove equipment heat gain, typically sized from the heat dissipated by transformers and switchgear divided by the allowable temperature rise. It applies the formula CFM = heat (BTU/hr) / (1.08 x allowable temp rise) and shows the working so you can check each step by hand.
Is the Electrical Room Ventilation Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.