Thejoeybrown
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Ya. What he said. LolU need a fresh input of c02, even if temps are not a problem,
You will really see a problem i n first 4 weeks of flower.
In veg, if just a couple, they will pull c02 from the ambient air since 400 to 600 is all they need... most basements can provide that. But a fan exhausting will pull air in from a passive intake.. put a hepa filter from lowes on the intake to stop bugs,pests, and spores from entering...