Sauna Ventilation Calculator
Fresh air exchange rate for a sauna room.
Enter your values
ⓘ Live results
Results
- Ventilation airflow
- 17.5 CFM
- Room volume
- 210 cu ft
- Intake vent size at 200 FPM
- 12.6 sq in
Quick answer
Saunas typically need about 4-6 complete air changes per hour to control humidity and refresh oxygen despite the heater running.
CFM = volume x ACH / 60
How to use the Sauna Ventilation Calculator
- 1Measure the sauna's internal dimensions.
- 2Apply 4-6 air changes per hour for typical dry sauna use.
- 3Place the intake vent near the heater and exhaust low on the opposite wall.
Worked example
Using the values the calculator loads with:
Inputs
- Sauna length6 ft
- Sauna width5 ft
- Ceiling height7 ft
- Target air changes5 ACH
Results
- Ventilation airflow17.5 CFM
- Room volume210 cu ft
- Intake vent size at 200 FPM12.6 sq in
Frequently asked questions
Why does a sauna need ventilation at all?
Without fresh air exchange, oxygen drops and residual humidity and odours build up between sessions.
Does this apply to infrared saunas?
Infrared cabins need far less airflow since they don't use hot rocks or steam.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.