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The best air circulation system has an intake vent and an equivalent size exhaust vent to release stale air from the sauna. Between the two vents a slow air movement will maintain the proper oxygen level in the sauna. Without the exhaust vent, no fresh air can enter the sauna. The fresh air is normally just the air from the home. The exhausted air has no identifiable smell and can be released back into the home, particularly in the colder months when the home is being heated. Residential saunas do not require venting to the outside of the building. Only commercial saunas that are continuously used by many people need to be vented to the outside. Wood-burning heaters require a larger air supply as the fire also needs the oxygen in the sauna room.

Naturally forced sauna ventilation Heat pushes air upward, drawing cold air from an opening at the bottom of the wall behind the heater. On the wall opposite the heater is a vertical vent. A chimney effect draws the air through the vent and out of the sauna. There is low heat and no steam under the bottom bench area.

Mechanically forced sauna ventilation Mechanically forced method forces the air to be mixed over the heater and spreads the heat throughout the sauna evenly. The exhaust vent on the opposite side of the heater wall has a fan to draw the air over the heater, circulating the heated air throughout the sauna. There is low heat and no steam under the bottom bench area where the exhaust of ventilated air takes place.

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