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I have a 5x5x7.5 grow tent with a 600watt light/air cooled hood, with a 175cfm 4 inch fan. i want to set up a passive intake. Basically, what I want to know is if the 4 inch fan is enough, I think it is, based on the math. Does the intake need 6 inch ducting if the exhaust is 4 inch? will this...

hey guys, can you look at my diagram and tell me if my math is ok, using a 4inch 175 cfm fan/4 inch ducting, and a 600 watt hid the tent in question is 5x5x6.5 I know i'd be safe with a 6 inch, but i already have a 4 inch,id like to utilize what i got also, for a passive intake, is 4 inch out 4...

PH = 6.4 Nutes = none temp = 83 RH = 23% I have a 600 watt hid in a 4x4x6.5 tent the light is about a foot away from the plants... this is how they look... they have been stuck in this phase for about 4 days now. What's wrong with them.... they arn't over or under watered.

Huge problem... i have a 600 watt hid in a 4x4x6.5 grow tent it's about 24 inches above my three clones... so far nothing but reverse osmosis water with no nutes... the new growths are quite yellow... also the leaves are a bit droopy. The temp in there is a good 80... the light is air cooled...

http://www.youtube.com/watch?v=yy62DdNpsqc tell me whatcha think.. if enough people are interested i'll post a diy tutorial.