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does anyone know about how well these work...

I was wondering if any one could give me some detailed info about haw I should properly ventilate my closet. 5ft,length 4ft,width 5ftheight. I have now a 3" intake hole with a 4" desktop type fan, and a 4" exaust hole duct to the outside, with the same fan driving air out. I am also running 2...

Ok, here I am 2 months into a grow and plants are 40inches tall. the problem is I havent cut the lights back yet... I am finally ready to do so but I only have 8inches of grow height left. I know I have to top them, this would be the second time, but how much should I take off and how long...