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Hello, I have a grow space about 50x120x200cm with one 400w hps lamp. I calculated that I would need about 60cfm but I have a feeling that's wrong. Could you take a look and tell me if this 240cfm fan do me for ventilation? http://www.ebay.com/itm/like/121311847857 Another I've been looking...

Hello, sorry for posting another thread but I have a different question. Could I use a regular 6" kitchen extractor fan as both the intake and exhaust? (One one way for intake, and another the other way for exhaust) This is the fan I have been looking at...

Hello! I'm a newbie, just started growing. I have a grow box set up in a wardrobe lined with fire blankets and mylar, and one 400w hps and reflector, planning on getting a couple of led lamps, and I have a 6" fan as well. I know I will get a lot of stick for this but traditional ventilation is...