co2 and portable ac

Hey guys first post, not really having any issues.,currently running a for positive pressure sealed room. However I've combed the web and can't find a good negative pressure system, however I think I have a way just need some feed back.,...

System would be as follows.

Scrubber inside room>variable speed fan exiting room>duct T that connects to portable ac fresh air in>small 4 inch inline pullin into ac>portable ac back inside room. Am currently using a 14k btu duel hose ac that doesn't draw from tent at all(no co2 removed) my question is do you think the co2 will recycle through the grow ac.

Dual or single tube ac?

Duel. Intake comes from fresh air and exhausts outside. My theory is I can tap the intake and recycle my co2 through the ac

Anyone?