Humidity and airflow question

Figgy

Well-Known Member
So I'm on my first grow and first week of flower. My humidity levels are around 49-59%. I put a small dehumidifier (Eva Dry 1100) in the tent (3x3), but I don't believe it can handle the air exchange of my fans. I have a 400 cfm exhaust fan, and a 225 cfm intake fan so I'm exchanging air in the entire tent around 5 times/min. Exhaust fan is on 24/7, and intake on during lights on. My humidity levels are lower with lights on due to the intake fan being on. So will this be ok for the entire flower cycle, or do I have to invest in a whole room dehumidifier?
 

GrowinDad

Well-Known Member
In addition to Buds advice, I would scrap the intake fan altogether and go passive intake. Put the dehumidifier near the intake outside of the tent. I find it easier to control the environment in the tent by adjusting what is going into it rather than what is in it already.
 

Sand4x105

Well-Known Member
Etc...
And, don't forget, your RH reading....and your Temp reading....
Between the lights, and the top of your plants colas... this area....
This WILL Be.... 4-7 degrees hotter, and 4-7 RH points lower than the ambient for your tent....
If you keep running your dehumidifier, the plant tops, will turn premature yellow, and you will be coming back on here to ask why....
A year ago.... I ran my Dehumidifier in my Bud Room... Never again...
Lights on... if room runs in the 40% -50% range/lights on...and [up to and below 60% lights out]... NEVER worry about it....
 

Figgy

Well-Known Member
The dehumidifier is way too small to make any difference in the room the tent is in. I'm just running both fans 24/7, and returning the dehumidifier. Keeps RH 49-53% in the tent. I also have my temp/RH meter hanging from my hood at canopy height. Connects wirelessly to the main base so I can monitor at all times without opening the tent.
 

Figgy

Well-Known Member
So we had some good rain yesterday through last night, and I watered the girls last night. Come home from work today and 62% RH....looks like I have to buy a good whole room dehumidifier. The list of items for growing never ends.
 

GrowinDad

Well-Known Member
It seems that way but once you are dialled in that stops. It freaks me out now to walk into a homedepot and not need anything for my grow. And once you do the math vs cost of buying, it all pays for itself very quickly!
 

JointOperation

Well-Known Member
i have 4 temp / humitidy gauges in my rooms.. all over the place up at canopy temps.. root temps.. ambient air in the corner temps.. and temps of the intake..

different places in your room = different temps and humidity,.. unless u have enough fans for circulation it can cause problems.. a dude i know just had PM outbreaks because of not enough Fans.. i try to put 2 osc fans per 1000w.
 
Top