No ventilation or air circulation can prevent this.
Cedar wood sauna toxic.
Native to the pacific northwest and the original cedar wood used in traditional native american cooking.
To most people naturally occurring wood phenols are harmless but people with particular sensitivities or people who are prone to allergies should avoid saunas made from cedar and other fragrant woods.
Composite woods are made of a mixture of wood fibers plastics glues and other binding agents.
All wildwood grilling cedar planks are made from western red cedar.
Never use synthetic wood in a sauna.
Best of all not only is it not prone to toxic off gassing it actually gives off a pleasant scent that can add to the relaxation aspect of the overall sauna experience.
However some may be sensitive to the cedar odors.
If what was being outgassed from wood into the air was harmless say like the smell of vanilla from a baking cake this wouldn t be a problem.
But in the case of cedar and hemlock and other softwoods the chemicals that produce the scent they give off can be to some people annoying or intolerable even dangerous.