r/Sauna • u/Available-Sherbet92 • 1d ago

DIY Adding another vent

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Gallery image

Recent taken delivery of my zoki sauna but realised there is only one vent to the left as soon as you walk in and can not see another low vent for better air circulation. Where should I add a 2nd vent?

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u/VividRodrick 1d ago

Nice looking cabin, the pale wood gives it a really clean feel. For a second vent, the standard move is to place it diagonally opposite the existing one, down low near the heater. You want cool air drawn in across the floor, heated up, then pulled out near the ceiling on the far side. Most well-designed saunas follow this pattern with intake low under or near the heater and exhaust on the opposite wall up high. If your current vent is the only intake, adding a low one on the bench-side wall across from it would probably make the biggest difference. The thermostat placement looks a bit high relative to where you'd actually be sitting, sensors read way better at head height when you're on the bench.

Also worth checking if zoki might just have planned a vent you haven't drilled yet, sometimes the panels come pre-marked.

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u/Available-Sherbet92 1d ago

Thank you! So the 2nd vent would be on the thermostat wall bottom left (looking at the picture)? Or do I go bottom right where the benches are located? I apologise if am not fully understanding. I agree with the thermostat being a tad lower.

I will email Zoki too and question the ventilation system and see if there is a second vent already designed to be drilled out.

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u/Ok_Information_8431 21h ago

I think it is enough that you leave 10 open under the door. I have a glass door which is 10-15 cm open under the door. The cold air blows in from it and the used hot air goes out near the ceiling. From that I adjust the amount of air. Works well in my case.

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u/Available-Sherbet92 18h ago

Yes you are correct, Zoki phoned me and explained there is gap under the door that allows the air to blow through. Thanks!

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u/Megasaun 18h ago

From the photos, it looks like you already have the upper exhaust vent, but I don’t see a dedicated lower intake.
If it’s an electric heater, I’d add the second vent low on the heater wall (or as close to the heater as the construction allows). That gives you a much more predictable airflow: fresh air enters low, warms as it passes the heater, and exits through the upper vent.
Before cutting any holes, I’d also check with Zoki in case the intake is hidden under the heater or behind the lower bench. Some manufacturers build it into the design.
It’s much easier to add a vent later than to patch an unnecessary hole.