Olympian WAVE 6 ...A review

I agree Mex there are other contaminants that are place into the air from weird sources. But the ventless heaters complicate things even more by burning those contaminants and emitting them directly into the air we breath. The burning produces new/more contaminates. It's the by products of those contaminants created by the burning that are unknown and potentially more harmful than the original chemicals.
We know the potential for CO and other known byproducts. It's the unknown by products that are reason for real concern