First time Dwc grower, let's talk about RH during veg

zen0n

Member
Hey guys, first time growing and running a 8x8x7 tent (growing in 4x8 section), 2 Mars hydro ts3000s, 8 5 gallon buckets and 2 AC infinity 6" fans. Tent is a cold basement. Before the issues night temps were 69 and days 75. Was having lack of heat issues so picked up a delongi heater which works marvy, setup on my home assistant install to control temps. Trying to stay on the low end temperature wise to manage bucket temps as I have no recirc in this setup.

I've setup an esp32 device with a dht22 temp/humidity sensor in the tent for monitoring.

During early veg, the in the tent was way dry (duh), so ran my humidifier to bring it up. As the girls started getting older, by week 4ish now they're drinking upwards of 2 litres per day now and transpiring a ton of humidity.

My 2 6inch AC infinity fans running full tilt don't seem to be able to keep up with the humidity at all. Even with outside RH of 45. So I went and picked up a new 50 pint dehumidifier. Which is definitely taking care of the humidity issue, but the thing cranks out heat pretty good.

I ended up getting lucky and tied into the central AC duct going into the adjacent laundry room and punched a hole in the wall to duct then AC into the tent. Good news I guess I'll have heat in the winter now lol.

I'm thinking in theory as long as I'm running the exhaust harder then the intake I should be able to not have much going back into the house HVAc system. With the humidifier running and AC tied in, the temps sit around 79-81 during day cycle.

But my main question is about the fans having such a hard time pulling humidity out of the room. I have I have carbon filters on both intake and exhaust but Im wondering if maybe the fans don't push air thru the filters as well as the pull perhaps? Ideally I'd like to not have to run the power heavy dehumidifier

I'm going to try pulling off the filters for now,. But keep the sock filter overlay filtering dust/bugs and shit somehow on the intake.

Another factor I'm sure is outside RH, of which today it's about to rain and is sitting at 65. But usually it's quite dry here this time of year.

Anyhow thanks guys!
 

Billy the Mountain

Well-Known Member
You didn't state the RH% inside the tent. You can get away with higher RH in veg. I've had veg RH% 65-70 and did not experience any adverse effects.

Check a VPD chart to see where you're at.
 

J232

Well-Known Member
If you push threw a filter, you need to still use a pre filter to protect the carbon. Grab a dust shroom for the intake, they have zero cfm loss and are hepa. You can also build a jig to slide furnace filters in to filter incoming air.
 

zen0n

Member
Lol I can't believe in my wall of text I didn't specify the rh of the tent :). But I have the dehmid set to 55 but I would say the avg is more around 60 looking at my ha dataScreenshot_20210519-140657_Chrome.jpg

And yeah I was kind of hoping going the lazy way and throwing a carbon filter on the intake that i would eventually swap to the exhaust would work. Maybe not heh.

Time to MacGyver some kind of intake filter I guess.
 
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