DIY How To Build A Sauna FAQs
Venting your indoor sauna | We get these questions alot:
- Can I vent my sauna heat back into my house?
- Or do I have to vent the sauna to the outside?
It is best to vent the sauna back inside the house rather than to the outdoors. The main reason is that the barometric pressure outside is often different than indoors and this can create reverse flow bringing air from the outside in. Also, you always want to minimize penetrations to the outdoors. Though it might seem like a great way to add heat to your house, but a sauna will add very little positive heat to your home as by design; it is meant to heat a small enclosed space. Also FYI, the sauna will not add any significant moisture to the adjoining air space. Even when you ladle water over the sauna heater rocks you add very little actual humidity to the air. Saunas provide very dry air. The humidity of a sauna ranges from 10-35%.
Most importantly, the air coming into the sauna through the intake opening should be fresh and cooler than the heated sauna air. Fresh air also affects the sauna heater's thermostat and hi limit sensors. Otherwise, the sauna heater may sense that the room is prematurely hot and thus shut the heater down before the desired temperature is reached. Also the fresh air air will have slightly higher oxygen levels but do not be concerned with oxygen levels as the sauna rooms are no where near near air tight. Many saunas do just fine with a wide crack at the bottom of the door serving as the intake vent.
See more information relating to this subject under our accessories: sauna vents and grills. Also see our full article on this topic: Sauna Venting and Framing Info. Vents and grills do not include hardware as customers have different size nail guns or preferences on screws. We use 1 ½” galvanized (or stainless) finish nails.