co2 Vs grow tent vs circulation

My setup will run a 4x4x7 tent; 1000w + (5) hand picked ladies. Before I get there, I am looking for advice on proper air circulation. If I am looking to keep the tent sealed, for minimal loss of light, I obviously need Co2 supplementation right? I have planned for that. Herein lies my 'noviceness'. How do I keep the tent sealed, and get good external airflow and keep my Co2 ppm up?
I am familiar with active circulation ...

id like to know too

most grow tents come with in intake and outake airhole. the intake slot should be at the bottom and outake at the top. proper circulation would require one fan blowing clean air in and the outake fan suckin old air out. depending on the quantity of pants the amount of fans will need to be adjusted. the ideal tempeture you want is around 75 but anywhere from 72 to 78 should be fine. Co2 supplement is not necicarry but can be helpful in overall outcome. I hear baking soda and vinegar mixture is an inexspesive way to create co2 in your tent.

I use a 600w in a 4x4x7 tent. I run one fan/blower which does a passive intake and exhausts out through my hood and then out the tent. You have to have a large enough fan and filter for this to work. Basically while the light is on, I run the Co2 and fan on 15 minute cycles opposite of each other.

You can vent your light so that all air passing through it is separate from the air in the tent (outside > duct > light > duct > outside). With your fan blowing on high and low ambient temps you would be fine in a 4x4 with a 600w. A 1000w and you're going to have to add an AC unit IMO - or put the tent in a sealed room and CO2 the entire room.

Gastanker said:

You can vent your light so that all air passing through it is separate from the air in the tent (outside > duct > light > duct > outside). With your fan blowing on high and low ambient temps you would be fine in a 4x4 with a 600w. A 1000w and you're going to have to add an AC unit IMO - or put the tent in a sealed room and CO2 the entire room.

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I agree on the 1000w. No worries with a 600w. I used to do it that way, but I'd rather use 1 fan for both. Seems cleaner and more efficient to me.