interesting thought but it's hard to seal up a vessel for any length of time. you could perhaps do a positive pressure vessel that slowly leaks from inside to o

interesting thought but it's hard to seal up a vessel for any length of time. you could perhaps do a positive pressure vessel that slowly leaks from inside to out. (this is a common tactic in clean rooms with purified air a psi or two more pressurized than the hallways so the clean air always flows out to the hall.) not sure what the effects of leaking CO2 into your room would have though.