Is it possible to vent back into grow room?

anzohaze said:

Yes, get a good carbon filter and fan to cycle air in room every 3 minutes or faster. Get a filter to big for your room and a smaller fan for filter. If it is hot outside then you will be doomed. But yes add a thermostat. @vostok what's the name of the thermostat you use. The one You put me onto for heat extraction

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nomofatum said:

No, don't vent back into the grow room, I don't think that could even be considered venting. If you don't move air out of the grow you won't pull new air into the grow. If you don't pull new air in, you need to maintain CO2 levels artificially and you have to handle humidity build up in the room. If you vent to an outside room you will circulate the air and you can handle humidity issues outside of your grow space. Put the dehumidifier "up wind" from your grow intake.

I vent my grow to the room above it and have the dehumidifier where-ever I want it in the house. I only grow in winter as I use the grow for heat and can't maintain reasonable temps in summer or warmer parts of spring/fall. Plus there is a whole world of free light outside to grow as much as I want come summer. (Start hiking, it can be rewarding, evil smile)

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Gquebed said:

Im doing something similar... i draw fresh air into my tent from a window and exhaust from a tent into that same window. The two duct holes in that window are just inches apart. I know the exhaust is being drawn back in by the intake because the intake air is fairly warm even though it drops to -10 to -25c outside at night. I also know that the exhaust air is mixed with enough fresh air because the plants have shown no signs of co2 deprivation.

What i would worry about in doing this inside is that where the exhaust air is being mixed with "fresh" air will soon become completely stale too unless there is fresh outside air being brought in from somewhere. I have made this mistake already and it is tragic....

Signs of co2 deprivation look just like nute probs. So you chase around in circles trying to figure what the deficiency is and then you start flushing because you think it is lockout from salt build up and so on...but really it is as simple as just getting fresh air...

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