Anything that moves the air is fine. And yes, opening windows would be a sensible thing to do in that context. That said, I'm not sure I buy the thesis as a wh

Anything that moves the air is fine. And yes, opening windows would be a sensible thing to do in that context. That said, I'm not sure I buy the thesis as a whole. As far as I am aware, last time this came up, the Navy has done pretty detailed tests on CO2 concentration as a result of submarine warfare and found no significant impairments up to 1200ppm.