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yep, I had a 95cfm squirrel cage fan that I had sealed on the exhaust, and then I left only one of the 2 velcro windows open and one of the weird little drawstring sleeves on the opposite side for maximum passive intake.
I found that that arrangement actually created enough wind inside the tent that I didn't even need another fan inside. the passive intake facilitated evapostranspiration, it was magnificent
lol dude you have 112 cubic feet. 449cfm is HUGE overkill, but I'm sure it'll only make the buds nicer. it's not so much overkill that'll it'll be bad, it's just about 5 times more than the minimum
well if you have both I'd say turn on the 600 in there for a day or two and see how hot it gets. if it remains reasonable, then put some girls in there and grow some sexy nugs