Properly Ventilating a Climate-Controlled Grow Shed

sheckylovejoy

sheckylovejoy

Well-Known Member
Hi. I'm in the process of building out a 7x7 shed into a grow room. I've decided to fully climate control it, which means insulation, A/C, heater, humidifier, dehumidifier and circulation fan. We intend to seal up all the seams so there's no light or air leakage.

Given all this, I'm reconsidering whether I need a ventilation fan to bring in fresh air from the outside, as this will make my expensive climate control even more expensive. Here's how I see the options:
  1. Put in ventilation fan/chimney and run it for short set periods throughout the day (say, 10 minutes, 6 times a day).
  2. No fan and just rely on opening the 6x6 doors when I do daily maintenance in the mornings for fresh air.
  3. No fan, but add some sort of CO2 source inside the shed.

Let me know what you think, or if there's something I'm not considering.

Thanks for reading this.
 
ruwtz

ruwtz

Well-Known Member
I have a veg room not much bigger than this in a dedicated shed with high ceilings and I do not duct in any outside air. The door opens several times a day which brings in sufficient levels of CO2 and oxygen for the plants to succeed. Oscillating fans move air in the room, contributed to by the scrubber fan, and also the AC mini split and dehu whilst conditioning the atmos. My temps and humidity are set at all times, the plants are happy and growing is going, albeit on the very first run still.

I have considered adding a whirlybird or similar passive roof ventilation, but doesn't seem necessary at this point.

If you are adding CO2 in flower then think carefully about any ventilation plans because you may struggle to reach optimum saturation levels if the room is any less than very well sealed.
 
sheckylovejoy

sheckylovejoy

Well-Known Member
ruwtz said:
I have a veg room not much bigger than this in a dedicated shed with high ceilings and I do not duct in any outside air. The door opens several times a day which brings in sufficient levels of CO2 and oxygen for the plants to succeed. Oscillating fans move air in the room, contributed to by the scrubber fan, and also the AC mini split and dehu whilst conditioning the atmos. My temps and humidity are set at all times, the plants are happy and growing is going, albeit on the very first run still.

I have considered adding a whirlybird or similar passive roof ventilation, but doesn't seem necessary at this point.

If you are adding CO2 in flower then think carefully about any ventilation plans because you may struggle to reach optimum saturation levels if the room is any less than very well sealed.
Click to expand...

Thanks for the quick response. I was sort of leaning in that direction to begin with.

I'm new to indoor growing so much of this is new to me. Is co2 only for flower? What ppm do you aim for? Are things like ez co2 any good, or should I stick with a canister system if I go that way?

thanks.
 
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