So I have a 4.5ft x 4.5ft tent. I have a 465cfm extraction cage fan. I have another cage fan of lesser cfm rating pushing air in . I have two passive vents.
Humidity is between 60%-80%. But temps have been running 82f when lites are on.
I get no water accumulated except from my tank sweat on the reservoir. I have 4 other fans inside the space circulating air.
I am 48 days or so into flower so I am concerned about bud rot, but have never seen evidence of it or any guttation.
If I add a dehumidifier or ac I will have to seal the space. This could cause other issues and would be a bit costly.
My gut tells me that with this amount of airflow I should be fine. But wanted to get other opinions.
Thanks.
Btw with this humidity I have been running extraction and intake at full throttle.
It’s a cob setup. 6x 75w and 2x 100w.
DWC. Any ideas on eliminating tank sweat would help as well.
I can’t pull in drier air as the tent is in a pole barn. So outside air is all I have. Humidity is at ambient when lights are off. Probably lower with lights on due to the temp increase.
Only thing that would eliminate the sweat is not using a chiller or if not using one then use warmer water but to be honest I had a 1.5x1.5x2m tent which is about the same as what you’re running and I had a 536 or something CFM fan with no intake fan which kept my humidity at around 65% so that could help you BUT if it’s in a barn not sure if that would really help with moisture as it’s outdoors
Okay maybe I’ll make one of the passives an active. I figure as long as the air exchanges rapidly I will be okay. Then if I see guttation I will have to bring in ac and dehumidifier and seal the room.
Only thing I found that worked was putting a dehumidifier with a constant drain in the tent with the girls. Raises the temperature a couple of degrees but drops the humidity.
With humidity that high, I would consider getting a plant which has been crossed with an outdoor strain and is mould resistant so you can worry less about mould.
maybe you are not circulating air efficiently. Drop the intake fan use both of them as exhause make bigger passive intake holes and remove obstacles and sharp curves from the ducts. I have a dehumidifier that is outside the chamber to avoid some of its heat, I cut an opening to put its opening through the wall and it pulls the air from the outside to the inside of the chamber and blows on the plants dry air. I do that with the exahaust on or else I would cook the plants. The dehumidifier does raise the overall temps a little bit by with this method I minimized it a lot and it works great to prevent mold. Good luck.
Well I think I am circulating well. My humidity in the tent isn’t higher than outside the tent. And I get no water accumulated on walls or plants. I will increase circulation though.
What dehumidifier would you recommend for this size tent?.
The sativas should be fine. I’m a little worried about the indica, but I think it will finish sooner. I do a sog type grow so the colas shouldn’t get very thick.
My only issue with putting in a dehumidifier is that the dry air it pumps out will be immediately evacuated.
I have a Wood’s brand dehumidifier. It is very old and works like new, I am not sure about its compressor size but I remember that it draws close to 200watts of power, is about 16"x12"x14"
you can figure out a way to move the dry air through the plants effectively. You just need a robust dehumidifier. The one that I have is great because it is rectangular so it is easy to fit in a clean hole and seal, and is metallic heavy duty, has only one button like the old volume wheel buttons that turns off when it is at the lowest setting
Just make sure overall area of the plants is getting a gently breeze, as indicated by the light shaking of the leaves from the air flow. Just don’t want dead zones for mold/mildew to settle. If that level of air flow is not happening now, it would mean adding a circulating fan(s) to spin air around in the tent.
This is taken care of, more than enough circulation. No dead zones as of now. Adding some dry air may help, but with the turnover of air in the room, I just don’t know if it will have enough of an affect and I cant change the air in the room so that’s that.
Gonna get max flow and turnover and keep mopping up the tank sweat. Maybe put in a bildge pump.
Which chiller? I would assume that the air from the other end of a chiller would be hot as hell and will cook the plants. A dehumidifier blows out regular temperature air, its motor just adds some heat to the area which can be managed.
True. Not super hot but warm and not constantly running. I have used a dehumidifier years ago and it did put out quite a bit of heat.
My only concern is the dehumidifier going to be effective despite the rapid turnover in the tent air. I think it might not be a significant effect. And an $800 dehumidifier is out of the question.
