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meezy4tw proved me wrong almost instantly lol. Listen moving air to keep a room cool is a science. My room sucks cool air in from the bottom and hot air out the top. However my house has piss poor ventilation so it sucks in 78 degree air , if i could suck in 10 degree air from outside and cool...

those booster fans only put out around 100 cfm in a straight line. My setup is almost identical, 4x4x8 with a 400 watt and yeildmaster 2 reflector. i use a 300 cfm inline fan and it runs about 20 minutes on 40 off maintaining between 80 and 84 degrees. However my intake temps are around 78...