What size intake fan for a 4x5x7 growroom

Discussion in 'First Time Marijuana Growers' started by classman45, Jun 22, 2017.

  1. I need to know the smallest intake fan to be able to bring in enough fresh air to keep the co2 levels up.

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  2. Basically take the overall cubic feet of the room (4X5X7) and plan on exchanging the air in that room every 3 minutes. There are more complex equations for figuring out the exact cfm you would need but that's the minimum.

    First grow using cfls.
  3. A piece of duct with a 4" inline I'd guess but I've never worked in such a small structure/space... Sorry
  4. you dont need intake fans, passive intake will be just fine with a strong enough exhaust

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  5. I was thinking of intake and no extract as I dont have any issue with heat at the moment and there ain't an intake or extract

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  6. What lights u gonna use
  7. I got a 300w led atm that I used already on a grow and I'm you g to buy another led but 600w to go with it.

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  8. Yea unless your gonna run hps setups you should be able to get away with a 390 cfm exhaust i prefer 6 inch duct

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