Co2 AND exhaust? can it be done?

Please forgive me if that has already been answered, I have searched extensively and can not find a clear answer:

I have a 1000w and a flood table with about 15 plants in it, i have a huge blower sucking air out of the room and blowing air through my 1000 watt up into the attic and that keeps the room at a nice 78 degrees, I have a portable A/C but I havent had to use it yet, but its nice to have.

MY QUESTION IS. I have 2 options(PLEASE correct me if im wrong)

1) Suck air from somewhere outside of the room to cool off my fans, which would create no air coming out of the room, and then I could use my co2 that i forked so much money for but have no way to hook up a carbon filter and do some odor control... OR

2) Suck air from inside the room through a carbon filter, cool my fans, and everything work fine except NOT use my co2.


Is there ANY way to exhaust air from the room and still use co2? I would like exhaust and filter air out of the room, but i still want to use my co2, is this possible?

cmon someone has to have some insight on this.

Use the scrubber, all internal to the room for oder control.

Duct the lights, cooled from outside air, and the exhaust from lights goes outside.

Dump in CO2.

Room will still get hot via radiated heat from lights.

Vent the room when the CO2 ppm drops to a low # and temps are up.
Cool off the room and then start the CO2 again.

Yup, 2 pricey fans, 1 moderate (plus an extra for circulation. Though the scrubber can be redirected for that)

mrjoeyjiffy said:

Please forgive me if that has already been answered, I have searched extensively and can not find a clear answer:

I have a 1000w and a flood table with about 15 plants in it, i have a huge blower sucking air out of the room and blowing air through my 1000 watt up into the attic and that keeps the room at a nice 78 degrees, I have a portable A/C but I havent had to use it yet, but its nice to have.

MY QUESTION IS. I have 2 options(PLEASE correct me if im wrong)

1) Suck air from somewhere outside of the room to cool off my fans, which would create no air coming out of the room, and then I could use my co2 that i forked so much money for but have no way to hook up a carbon filter and do some odor control... OR

2) Suck air from inside the room through a carbon filter, cool my fans, and everything work fine except NOT use my co2.


Is there ANY way to exhaust air from the room and still use co2? I would like exhaust and filter air out of the room, but i still want to use my co2, is this possible?

Click to expand...

it's very possible, I will try to explain what I did.... I drilled one hole into the attic through my bedroom closet, next to the attic vent to the outside of the house, I put an inline fan in the ducting and there is my fresh air from outside my grow tent. I have my big 474 cfm exhuast fan sucking air out of my tent and going through the carbon filter and it expels into the closet (since the tent is a room by itself I felt I didn't need to drill another hole) I have one of those cheap home depot fans to pull hot air from my reflector(this one is on as long as the light is on no matter what) Get two tuimers, one for your CO2 and one for your big exhuast fan, co2 15 minutes, everything off 15 minutes(to give the plants time to enjoy the co2)15 minutes exuast fan on and repeat this cycle, I am just setting up my real first time grow for the last 3 days I am doing a trial run to make sure all the timers are set and work properly, so far so good. I will try to post pics in a couple of days, if I am doing something wrong will someone with more experience let me know

if your current set up is fine with odor and temps and all you want to do is add CO2 i would just put your fans on timers so they shut off when your co2 turns on.

have your fans shut down for 45 minutes when your lights first come on. at the same time have your co2 come on for 15 minutes and then shut off. your plants will get CO2 for 45 minutes and the room will be relitively cool becuase it hasnt had a chance to heat up yet.

do the same thing 6 hours in and 1 hour befor lights off. if you find the temps get too high during the second two times you could always have the ac on a timer to come on for 15 minutes in the middle of the 45 minute co2 dose. you should be fine, it probably wont get above the high 80's. the benifits of co2 will out weigh the short temp spikes, plus plants with co2 can handle higher temps.

just make sure you calculate your room capacity so your not wasting co2- my co2 gauge came with a formula, just dont remeber it off thetop of my head.