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Thread: Custom Ventilation System

  1. #25

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    Casper is correct. It is that simple to jumper the ATX to always being on.

    Another option is to find a cheap older AT power supply.

  2. #26
    SirKristoff is a poopiehead Ozzy's Avatar
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    Thumbs up

    That is really a nice setup, Homer.
    They say that imitation is the most sincere form of flattery, and I hope you agree. I am in the middle of creating a setup that is similar to yours.
    I took a 10 gallon tank filled it with water. I have a airstone and a heater in the tank.
    I have a 115v fan that I got out of an electric control panel. I'm going to take a piece of Plexiglas and cut a hole in it to mount the fan. Then I'm going to take a hose out of it to a new growroom I just built.
    Since the fan will get it's intake from air outside the room, it will work for ventilation too.
    I have some other ideas for it too that I'm not sure if it'll work. I'll have to experiment and see after I get it setup.
    One idea that I have is to place a piece of Plexiglas in the tank, from top to bottom. The Plexiglas will be cut below the water line so that the water can flow through. I'll have the fan side airtight (except for the fan intake). This will create two chambers in the tank. As the fan blows air in it'll force it below the water and force it to come up in the second chamber and out through the hose into the growroom. That way it'll pick up the max. moisture and heat from the water.
    Like I said that's just an idea right now, I'll experiment with it more after the unit is built.
    Homer. Thanks again for the great idea.

  3. #27
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    Smile

    Thanks Ozzy. I've noticed in my system that the fan does have some blow-back through the fan itself. [img]http://www.**********.com/iB_html312/non-cgi/emoticons/sad.gif[/img] I wonder if you might encounter the same problem, since you desire to push the water from one chamber to another. I hope that your experiment works for you. Please let me know if it does or doesn't push the water.

    Does your exoterra fogger have any negative effect on any of your sundews, etc in your terrarium(s)? I'm concerned that the sundews may not like the misting like other plants, such as heli or nepentes would.

    -Homer

  4. #28
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Quote Originally Posted by [b
    Quote[/b] (homer @ Nov. 11 2003,4:17)]Does your exoterra fogger have any negative effect on any of your sundews, etc in your terrarium(s)? I'm concerned that the sundews may not like the misting like other plants, such as heli or nepentes would.

    -Homer
    Generally sundews will do fine in a light mist. Mine don't like it when my fog collects and beadup on thier leaves and they look like a wet noodle. If the air is moving and humidity is in the air rather than condensing on the plants I think you'll be just fine.

  5. #29
    VFT and Drosera lover vft guy in SJ's Avatar
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    Homer,
    Are you still taking data on the temps and humidity and stuff? Im still interested in that info.

    Thanks
    Steve
    There are only 2 infinite things... the universe and human stupidity, and I'm not too sure about the universe.

  6. #30
    SirKristoff is a poopiehead Ozzy's Avatar
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    Homer I do have the same problem. Some air blows back though the fan. At first I had so much air blowing back out of the fan, I thought I had the polarity backwards on the fan. Even with all the air backflow through the fan, I'm still getting quite a bit of air flowing through the exhaust. For my exhaust pipes I used two 1 1/4 inch pipes. I wished I had upsized to at least 1 1/2 inch, maybe even 2 inch pipe.
    I think there are three things you can do to lessen the problem of the backflow of air. 1) Bigger or more exhaust pipes from the tank to your plants. 2) More air capacity in your tank. Either a bigger tank or lower water level. 3) A smaller fan. I think option #2 will have a limited, if any, effect on the problem. Why this is happening is because the fan is trying to blow more air into the tank than the pipes can handle. Over time it can burn the motor up on the fan.
    I haven't tried to force the air under the water yet. Mainly because it's going to be harder to make the first chamber air tight than I thought. I had to cut out for the heater and the hose for the airstone.
    When I first started it I put as much water as I could in the tank. I had less than a quarter inch from the water level to the exhaust pipes. That gave me about a 1/2 inch of air in the tank. I "wrongly" thought more water = more humidity. After I started the tank I realized it was the other way around, more air = more humidity. I started the tank Saturday night. and the water level have dropped pretty fast, I'm using a ten gallon tank and the water level dropped about 4 inches. I didn't record any humidity levels before I started the tank but I don't think the tank as helped very much. Since I have had the tank running the humidity levels have been between 50 and 80%. I want them near 100%. I'm hoping that as the water level drop even more, the air in the tank can hold more humidity and increase the humidity in the grow room. It may take a while because the grow room is pretty big. About 8 ft high, 5 ft deep and 4 ft across.
    Today I changed it a little. I made the intake for the fan come from the grow room, that way it will be recycling the air from the grow room and not using the dry air from the inside of my house. I hope that this will speed up the time it takes to build up the humidity.
    I have thought about putting one of those small fog machines in the tank. Does anybody know if they are ok to use with cp's?




  7. #31
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    Angry

    I see. I took readings yesterday of my system from the end of one of my exhaust tubes without the fogger running, and humidity level tapered off to 64% RH. I inserted an airstone to see what would happen, and the humidity level stayed the same, give or take +/- 1. I let the system run about 10 minutes to get accurate results.

    My finicky fogger does not seem to run in distilled water, but runs just fine in tapwater. go figure! That's why I ran the above experiment. BTW Ozzy, the water level was about 3" during these trials.

    I also put a moist cloth between the 5.5 gallon tank and exhaust tubes. The air flow was cut dramatically, even though the material was relatively thin.

    Sorry Steve for the lack of data that you wish to collect. As you can see, there are some issues using this method of ventilation at this time. We still have some issues to iron out...

  8. #32
    VFT and Drosera lover vft guy in SJ's Avatar
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    Thats ok Homer, this is part of the data I am interested in.. not only the hard numbers but also the observations of the problems of the system.. I really like the idea and I am strongly considering implementing something similar in the near future, in the meantime I hope to take advantage of yours to gather data and observation [img]http://www.**********.com/iB_html312/non-cgi/emoticons/smile.gif[/img]

    Thanks
    Steve
    There are only 2 infinite things... the universe and human stupidity, and I'm not too sure about the universe.

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