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Question about carbon filter, CO2, and air exhaust/intake

Discussion in 'Grow Room Design/Setup' started by drw33ds, Jan 22, 2010.

  1. Hey GC,

    So I'm working on my second grow and I'll give you an idea of how my first grow went to understand where I'm coming from. The closet is 100 square feet. I used a cool tube with an industrial blower blowing directly into the cool tube; the other end went out the ceiling. Fresh air was bought in from under the door by the suction from the blower, about an inch and a half high by 20 inches wide with no carpet to block airflow. Because it was just one system, the temperature remained around 78oF and 30% humidity throughout all growth phases. This design made it possible to not worry about smell or fresh air since air was always being sucked into the closet from around and under the door.

    I want to do it differently this grow by growing hydroponically and using a CO2 tank. Obviously I cannot use my first set up with CO2 being constantly sucked out of the room. My question is how do I set up a system with CO2 and a carbon filter while also having my cool tube extract hot air out the ceiling?

    Option 1: System 1: Carbon filter -> short ducting -> inline fan -> short ducting -> cool tube -> ducting to outside. System 2: CO2. I would obviously lose CO­2 if the inline fan was constantly running, correct? Does a carbon filter do anything to CO2?

    Or

    Option 2: System 1: Vent at bottom of door leading to ducting -> inline fan -> short ducting -> cool tube -> ducting to outside. System 2: CO2 + Carbon filter -> another inline fan. To make this less confusing, I would have fresh air sucked under the door, through the cool tube, and out the ceiling. Then there would be a closed system in the room itself with only CO2 and a carbon filter to eliminate the smell. Would a second fan be necessary for moving air through the carbon filter and keeping air circulation high in the room?

    I'm pretty lost on this. I read both air and grow room set-up sections in Cervantes's bible book, but still unsure of how to execute the whole system. Thanks in advance for the help. Peace.
     
  2. I would start by asking is this your first grow? If so I always suggest new growers keep it simple when learning. CO2 is not req. to have a great grow...but I think alot of newer growers see results of growers who may have yrs of exp. on them and get hung up on getting the same numbers.

    Is there a reason your not making holes and just using gap under door? CO2 is heavier than air so it would just flow out the gap at bottom of your door. Plus with a gap like you discribed sounds like you also have a large gap for light to get into your flowering stage.

    But more to your questions....
    You dont want to draw air from inside your grow space with CO2...everytime you have air being pulled out of grow, its also sucking the co2 out the vent as well. If you want to see a well set up grow smaller grow space using co2 check out Rumpleforeskin threads.

    just a thought but have you looked into how much setting CO2 up is? You will need a Co2 tank-150
    controller 400-600
    You can use a timer in place of the controller(but less efficient)

    Numb
     
  3. Thanks for the response. This will be the second grow like I mentioned. As for the door, I cannot adjust to make a vent. The plan was just to make a vent inside the door that would act as my air intake to my cool tube. This would also block light from shining from under the door.

    Here's a picture of what I mean. This is a simplified version, the box would not be that big, only at one end to attach ducting to, the rest of it would be like two inches high. I would have to step over it each time I entered the room. I would make it an air tight fit so when the door was open, the whole design would be pointless, but when closed, it would be a closed system with the room outside.

    [​IMG]

    I have looked at Rumples posts and pictures, but I guess I haven't read enough on how he does his. It's where I got the original idea from. I've also looked into CO2 and understand that its going to cost 300 + more even without the controller and I'm fine with paying that for my hobby. Thanks again Numb
     

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