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I was think about buying a 6inch fan or should I get two more 50cfm fans as the intake and use the other two 50cfm ventilation fans which I mentioned in earliers reply as the exhaust? But I will try it tomorrow with the two 50cfm fans.

thanks for the advice. I just purchased two 50cfm ventilation fan, would that work?

I was wondering what size of intake and exhaust fan to use to keep a 4x4x8 with a 600 watt hps? About to start my first grow room. Thanks for help!