should i still have intake and exhaust holes in my growroom if i am running co2?

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if you need it to control temps and vent then yes, if you have a sealed room and can control your temps and humid with out any fresh air or exhaust then why do all the extra work for nothing?

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My flavs. Grape Ape, Purp, Afghan, Green crack, Night shade, MK Ultra, Kings Kush, Train Wreck,Strawberry Cough, Kush berry, Bubba Kush, Pineapple, Skunk #1, LA Women..I want Chem Dog, and OG KUSH Original OG

so you do not need fresh air if you are running co2?

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The air we breathe has about 600PPMs of CO2. If you are trying to retain CO2 saturation in your room, a sealed room would be more efficient, and save on your CO2 injection costs. Fresh air is not required as long as your atmosphere has the right conditions. Most plants thrive with 1500PPMs.

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I can't help but think that that Chia Obama shit is just a joke. Cha Cha Cha Chia

You don't need fresh air, but as hwy420 said, more ppm during the flower stage when the lights are on is better.

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My flavs. Grape Ape, Purp, Afghan, Green crack, Night shade, MK Ultra, Kings Kush, Train Wreck,Strawberry Cough, Kush berry, Bubba Kush, Pineapple, Skunk #1, LA Women..I want Chem Dog, and OG KUSH Original OG

thank you + rep for both of you
but you need fresh air if you are not injecting co2 right? why is that?

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no you dont NEED it, I know alot of people that dont use it.. they just get less dense product and not as much weight

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My flavs. Grape Ape, Purp, Afghan, Green crack, Night shade, MK Ultra, Kings Kush, Train Wreck,Strawberry Cough, Kush berry, Bubba Kush, Pineapple, Skunk #1, LA Women..I want Chem Dog, and OG KUSH Original OG

but fresh air doesnt increase weight or make more dense buds if you inject co2?

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Nah; as long as temp, humidity and CO2 levels are adequate.

Humans & animals use Oxygen which is produced by plants, plants use CO2 to breathe . If you had a 100% sealed room & no CO2 injection, your plants would slowly deplete the CO2 levels and the oxygen level would increase; and they wouldn't be able to breathe with low CO2 & high oxygen... That's why most people bring fresh air in a sealed room if they are not CO2 injecting.

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I can't help but think that that Chia Obama shit is just a joke. Cha Cha Cha Chia

Close. Typical CO2 levels in a ventilated room or outside unless in an industrilal area run a level of around 340 ppm. The average level in a house during the day are about 400 ppm. Plants use CO2 as part of photosynthesis (when lights areon). The create O2 but they also respre 24 hours per day and realease CO2 when they respire. Plants if at temperatures of over 65 degrees under intense lighting require more CO2 thancan sneek in through cracks in a closed up room so need ventilation for growth related to lighting and temp. Plants in rooms with high intensity lighting at temps over about 75 degrees will need more CO2 that is supplied by mere ventilation or there growth will slow and the plants will tend to strech out. Then you throw high humidity in to the situation and it gets worse because the high humidity slows both transporation and respiration which causes even more problems.

The problem with plants and CO2 lies in the fact that they produce CO2 day and night but no O2 at night. They use more CO2 during the day than they produce, but they also produce CO2 at night especially at warm temperatures. This means in some homes with a plant filled with a well growing SOG the CO2 levels at night in the Bedroom can become quite high. This means even in the winter cracking a window is a good idea if you do not ventilate to outdoors. It is not uncommon for the CO2 level in a closed up home to e rise to over 1000 ppm at night when there is no ventilation. And that is without any plants producing CO2 that is not being vented outside. If you feel hot and sweaty at night in a room that is not hot or humid it is very likely the CO2 levels are above 1000 or maybe even 2000 ppm.