Other infrared saunas offer only a choice between no ventilation and passive ventilation. With that, you can simply open a vent, or close it.

High Tech Health saunas, however, offer a third option: active ventilation. With active ventilation, air is forced through a vent with a fan, similar to how healthy air is managed in the typical home. This offers significant health advantages over passive ventilation.

All Transcend saunas include active ventilation standard.

Exchanging sufficient air inside your sauna with the air outside of your sauna ensures that the air stays fresh and healthy, and doesn’t get stuffy.

This is very important in a sauna because the smaller enclosed space enables stuffy air to build up very quickly. This is uncomfortable and can make you feel drowsy. For some people this leads to feeling claustrophobic. This is unhealthy because carbon dioxide is displacing oxygen.

46% lower carbon dioxide

For a single adult in a two-person sauna, active ventilation maintains about a 46% lower concentration of carbon dioxide during your session compared to standard passive ventilation.

Carbon Dioxide Build-up
During 30-minute Sauna Session

What you breathe is just as important as the heat. In any enclosed space, every breath you exhale releases carbon dioxide (CO2). As this chart shows, saunas with only passive ventilation (red line) experience a rapid, dangerous spike in CO2 levels. This build-up displaces oxygen, leading to that “stuffy,” “air-hungry” feeling, along with potential fatigue, headaches, and dizziness—robbing you of the full benefits of your session.

The Exclusive High Tech Health Difference

This is why we engineered our exclusive Active Ventilation system, a proprietary feature you won’t find in other saunas.

Instead of just recycling stale air, our system actively pulls in fresh, oxygen-rich air from outside the sauna while simultaneously expelling the trapped, CO2-filled air.

The result is clear (green line): our Active Ventilation slashes carbon dioxide build-up by at least 46%.

This ensures you are breathing clean, revitalizing air, allowing you to relax deeper, stay in longer, and emerge feeling truly refreshed and rejuvenated, not drained.