CO2 and Circulation Fans

I have a CO2 emitter hose in the ceiling that disperses CO2 evenly throughout a 9x5 tent. I also have 2 circulation fans aiming up at my reflectors and 4 small clip on fans aiming at the plants. My tent is sealed well.

Would it be beneficial to turn my circulation fans off when my CO2 is running in the tent? If so, how long should I wait to turn them back on?

Co2 falls on the plants, leave the fans running, if the air is being mixed well you won't have issues.

Renfro said:

Co2 falls on the plants, leave the fans running, if the air is being mixed well you won't have issues.

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Will fans on all the time encourage CO2 to leak out of the tent? I’ve only been getting 3 weeks out of my CO2 tank.

thekevin07 said:

Will fans on all the time encourage CO2 to leak out of the tent? I’ve only been getting 3 weeks out of my CO2 tank.

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Circulation fans won’t affect the CO2. Do you have intake/exhaust fans?

What PPM do you have your controller set to?

I do and they are set to off during lights on and ppm is 1500 with a 20lb tank

thekevin07 said:

I do and they are set to off during lights on and ppm is 1500 with a 20lb tank

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Do you have dampers in the ducting?

thekevin07 said:

I do and they are set to off during lights on and ppm is 1500 with a 20lb tank

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If you want your tank to last longer, run your CO2 at 1000 or 1200 PPM, above that the gains are so minimal and in some cases even non-existent.

NukaKola said:

Do you have dampers in the ducting?

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No, I didn’t know these existed I ordered a couple

Renfro said:

If you want your tank to last longer, run your CO2 at 1000 or 1200 PPM, above that the gains are so minimal and in some cases even non-existent.

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Will do

You could definitely be leaking CO2 out of your intake/exhaust ducts. The dampers are directional so be sure to install them the correct way.

Another dampener note, I recommend the ones with foam/rubber seal, there are 2 types, one seals and one is metal on metal. Not sure if it matters but any air leak fixed helps.

A tip with the electric duct dampers. There is a spring that pulls the damper back to it's default position when power is cut to the damper motor. You can adjust this spring to make the damper close better or open faster. Speaking of a normally closed damper, if the spring is too tight, the damper may not open fully or opens really slowly. If the spring is too loose, the damper may not close all the way.

Tweak the spring tension to get the best results.

Also, the common dampers will accept 24 VAC power so you will want a 24 VAC transformer / power supply that runs on the same input voltage as your fan. This way the damper can be powered with the fan. Fan kicks on and damper opens.

Renfro said:

Also, the common dampers will accept 24 VAC power so you will want a 24 VAC transformer / power supply that runs on the same input voltage as your fan. This way the damper can be powered with the fan. Fan kicks on and damper opens.

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So, should I go with the electric damper or passive damper?
I have 4x 6” fans to exchange the air in the tent at night to keep temps outside the tent cooler and inside warmer. I foolishly put the ac system in the tent and it’s the smallest mini split I could find.

I need too keep the most CO2 in while evacuating at night as quick as possible

thekevin07 said:

So, should I go with the electric damper or passive damper?

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I have always went the electric damper route, felt the spring loaded ones would be a CFM killer but I have never tried one so I can't say for sure.

thekevin07 said:

I foolishly put the ac system in the tent and it’s the smallest mini split I could find.

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In the tent eh? You have any pics of that install? I am curious how you pulled that one off.