im doing a small grow in a 120cm x 60 x 180 tent and im trying to work out the smallest fan i can get away with.Im kind of tempted to get a 5inch rvk L with a controller, however i have a friend who has given me a 4 inch rvk and he says it will be fine if i just run on full.Obviously it will save me money but am I unestimating what i need???..thanks
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