Door open no exhaust

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Jmax

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I been growing with my tent door wide open with no issues, do I need to keep my exhaust fan on growing this way?
 
I been growing with my tent door wide open with no issues, do I need to keep my exhaust fan on growing this way?
I never close mine. I just keep a floor fan circulating air and no exhaust fan.
 
you will at least need an open window in the room to exchange the Co2 with O2 and an oscillating fan to move it around
 

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