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I've seen so many different answers to this question online.. What is the size ratio or power ratio of intake to exhaust supposed to be? In the Marijuana Bible I believe it says to have twice as big of an exhaust as an intake... well I have an almost 20 cf box and I have a bigger/stronger...

Thanks man,how many watts and how much space were you working with on your grow?

I had a very similar set up, and the exact same booster fan. I originally used it as exhaust but it didnt seem strong enough, especially with a filter on. So I decided to use it for intake and got a better exhaust fan, it seems to work ok now. Check it out...

Do you guys think I need more intake?

Yeah I think this grow is gonna be a lot tougher than my next one. Starting in September in the garage should be perfect!! I think that my box has such good airflow that it will be pretty close to whatever the garage temp is even with lights on.

Update on temps... Its 102 outside, 91 in my garage, 87 in my box with lights off. Have you guys been experiencing anything similar? Northern CA

Hi yall, this is my first grow box, I've done one outdoor grow before. Box is about 3'x2'x4' ish~. I've got a powerful exhaust fan, 2 circulating fans, and a 4inch duct fan for intake. I have pretty good air flow, unfortunately I'm in the middle of a heatwave in my area and since my grow is in...

Is there any risk of fire from foilage touching CFLs for too long?

I do have a small circulating fan. I was able to reduce the temperature a little bit by taking off my filter and turning up my circulating fan a little. I may use my exhaust fan, which I believe is too weak, for my intake instead and buy some better fans for exhaust. Where I'm confused is, I...

I take that back. I do have a heat issue. My temp close to the light was 98 degrees!! I will try to take the temp closer to where the plant is. So now I have a 4 inch fan with a carbon filter and I think it might not be strong enough, and a 2 inch intake. Could the problem maybe that my intake...

Ok no pics yet Ill have some soon but I do have some questions. This fan http://www.homedepot.com/p/Suncourt-Inductor-4-in-In-Line-Duct-Fan-DB204/100073963#.UcR-jdjNnsJ is rated 65-80 cfm but it doesnt seem to be strong enough. My box is only about 20 cf. I did the DIY carbon filter with the...

I was planning on hanging it horizontally. I think I will just try to have one PC fan exhaust and just some intake holes, and a circulating fan sitting in the box.

I'm having trouble deciding on the fan situation. I got another fairly powerful fan I was going to use for intake at the bottom. Except I think it might be stronger than my exhaust fan, is that a problem? I dont wanna push more air than i can take out I guess haha.

Thanks for the great advice Ogonzo. I never considered computer fans, will explore this further. I live close to home depot and the fan I linked is the only one they carry in store. I'm not sure if this matters as far as fan strength goes but I dont plan on having the air go through ducts, just...

Hi guys. I'm deciding to do 2 plants indoor this go around. I would like to keep it simple as possible. Growing in soil btw. Here's my plan... I'm going to build a box-3 ft wide, maybe 18 inches deep and about 4 feet high. I have a 150HPS light to hang from the top. I'm going to try 2 of these...

My first grow ever!! Probly about 30 an ounce... ill get better. It sure beats 300+!!

DAMN situation critical... still havent chopped. Parts of my plants look PERFECT. Hella cloudy, teeny bits of amber. and some parts are almost TOTALLY CLEAR. WTF!! I dont get much sun anymore and only about 2-3 hours of direct sunlight a day. WHAT SHOULD I DO!!!

How long was it in a jar?

Looks similar to mine. I got hindu skunk kush. Was completely green until october and went purp!! I think it has to do with temperatures dropping... not sure if it has anything to do with # of hours of sun. Also, as far as i know it isnt a bad thing

Pic didnt work... i have a plant that turned purple as well