how do you get exhaust without an intake? all you would be doing is sucking all the o2 and co2 out of the room and killing the plant. you need both, the air should be changed every 3 to 5 minuites

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Really? I was planning on having the A/C constantly running, thusly always bringing in fresh air. For about 10 minutes out of the hour, I would have the exhaust running. Then, when the exhaust turns off, I would have the CO2 kick in for about 20 minutes or so. The remaining ~30 minutes of the hour would consist of the CO2 air just chillin' in there. Should I switch it up?


-AR

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How To Make Cannabutter Goodies || My Growroom In Progress

i would have my exhaust running more so that you could get the air exchanged better. it would be ok to leave a/c on all the time as long as your temps aren`t to low. then work your co2 into that schedule some how. i dont know enough about the co2 to tell you how much to give. i know that to much is not good for us so it needs to be exhausted to.
i just use a bottle of sugar and yeast with water for my co2, but the more i read about it i see it`s not enough to make it worth it this way. it`s not worth the investment for me

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Man if you guys have AC and air filtering the internal air and supplementing with C02 you dont need the intakes and ehausts there people speak of.

I only use an exhuase for humidty control.

Look for CGE grows...none of them have intakes/exhausts.

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Current Grow - AK47 Day 33 Flower Grow Cabinet Build First Grow in new Cabinet C99 X A11

Thanks for the input. I wish I could do it that way, because that is without question the best way to do it. My problem is that my tent is set up in the attic and its insulated, so to pull attic air through the tube and back out of the tent would do little good, since the attic hits 120 degrees during some days.

Sorry, I should have been more clear. I'm using a grow tent, so the inside is already covered with white mylar. Also, I have an A/C duct straight from the air handler in my house feeding the tent so it always has fresh air from inside. I leave the air handler fan in the ON position, so its always pumping. This works well, and the air handler blower fan is only 300watts, so its no big deal. This setup works really really well for keeping the tent cool, and it has to be air tight and insulated so that the 120 degree attic air and moisture doesn't get inside. The insulation is on the outside of the tent.

I think I'm gonna go with Honkeytown's suggestion and put the fan outside and have it pull air across the filter and cooltube so that the fan doesn't add heat to the grow room. This is gonna work well I think and I will put up some pictures once its finished. I'm riding down to HTG in Melbourne today to snag a cool tube, so we'll see how it goes! Thanks for all the input guys, you're great.

Mate, I hope you won't but I think you are going to have issues with the way you are trying to do this

First off, I have a 3x3x7 sealed space in the garage @ about 76 degrees ambient. My space is insulated too about R6, but keep in mind it is wood construction, not a tent.
I have a designated widow type ac for this space and it comes on every 4 min. about in order to maintain my temps at about 81 degrees, it runs like 4 min. off 1 min on. Keep in mind AC also deals with dehumidification if done right! My light is completely isolated from my grow cab (I use co2 in a sealed enviro)
Your AC will not be sufficient I think the way it is run at this point. It lacks the necessary control you need. I would assume that your t-stat is somewhere in your house close to the air intake, which in turn means that your t-stat is rendered useless for your grow area, since it does not know what the temps are in your grow space. At best you will be wasting tremendous amounts of energy since you have to set the t-stat at an very low arbitrary temperature in order to make sure that you are not going out of range. This would mean that your house temps get waaaaay to low, and your ac unit will most likely ice up due to not cyceling off enough. There are ways , but by far the cheapest, best way would be to get a little indevidual window unit (check my grow cab/http://www.rollitup.org/grow-room-design-setup/86604-grow-space-build-sealed-no.html , maybe like 5000 or 6000 btu.

I think you may be able to make your set-up work somewhat, but your parameters will suck, you will not be able to use co2 due to the perpetual exhausting you are doing. I disagree with Bonz, Co2 injection is rather scientific and certain parameters need to be maintained in order for co2 to make a difference.
A good scinario would be:
Lights on:
Temp:81-83 (w. co2 only! IT NEEDS THE HIGHER TEMPS IN ORDER FOR THE STOMATA'S TO OPEN MORE AND UTILIZE THE CO2)
Humidity 50-60%
Co2 1100-1500 maintained with a controller (below 800ppm co2 will not make a difference, above 1500 will not give much added benefit. The shit is expensive so why waste it!

I do not exhaust during lights on, but I do run a intake in conjunction with and exhaust system that comes on during lights off. (Back-draft dampers are needed here so you do not loose your co2 during lights on.

Hope this helps somewhat, I'm sure I have left things out, but I'm happy to help out if I can!

Unity

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just curious what part of my post you dissagree with. i do believe i said i didn`t know enough about co2 to give an answer for that?

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Sorry about that Bonz , I disagreed with this portion:

" i dont know enough about the co2 to tell you how much to give. i know that to much is not good for us so it needs to be exhausted to."

I think I misread though, I thought you were advising to constantly exhaust your co2. But after I read it and your other posts again I retract and stand corrected

I do not run my exhaust/intake fans until lights off. Co2 becomes toxic to the plants at about 2000ppm, that's why a counter controller is a must in my opinion. Even though I would be more concerned with insufficient amount of co2 then too much, especially if you are using 'organic mater' in making the co2. Keep in mind that a plant will increase its co2 consumption by about 20x from seedling to mature.
So running the exhaust while injecting co2 would be a tremendous waste.

Unity

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hey no ass kiss. lol. i need to run my fan all the time when light is on because of heat. i dont have an ac, and need one.

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