Co2 enrichment for my tent

Hey grow buddies, I'm trying Co2 enrichment in my tent using carbon dioxide from the gas store.Its at 1000 psi a small tank approx 1.5 kg. The grow room is 1,2 m x 1,2 m x 2 m and I have a extractor fan that is running at 200 cubic meters per hr..so Given that info I wanted to ask

CO2 is for sealed rooms.

You're exhausting any money spent on the set up right out your exhaust fan.