Vent Question

I have a 4k setup with 80 girls in an ebb & flow SOG style setup with c02 at 1400 ppms. My question is do I need to provide the room with fresh air other than opening the door a few times when I go in the room? My theory is that even with c02 in the room the air can be stale and will need to be replenished with fresh air....your input would be great, thanks.

I read something somewhere where it said oxygen was beneficial at night and to exhaust and intake air into your room when lights go off since they can no longer produce oxygen through photosynthesis. They need oxygen to breath.

Thanks for the reply thats the answer I was looking for