Struggling with Humidity in 3' x 3' tent

GrowYourFace said:

^^^-Yes that's the (passive) intake.
One of the tweeks I was talking about was trying to get it into an "S" to block out the light. Hopefully done this morning.

As mentioned yesterday, I am feelng very good about this major adjustment.

Click to expand...

Oi no wonder you're having problems. If that is your only passive intake it's positioned wrong. Unless of course you have another I can't see in the pic, regardless that is basically useless. Simply because the air that is coming in is instantly being sucked out a couple inches away. Because of this no air is circulating down by your plants.

Here's a pic showing exactly what is happening with that air. A passive intake needs to be at one of the holes in the bottom at the opposite end of the tent.



The setup you see in the image made in paint, draws air in from the bottom/opposite end of the tent, you have a fan blowing spreading that fresh air in and then it goes through your plants into the exhaust fan at the top/back part of the tent. That gives optimal airflow ^_^ As you can see from the arrows that fresh air from the intake isn't even going no where near your plants, or lights for that matter.

Hi Nookies.
Yes, definitely thought about this. The #'s are much better and the plants are definitely being moved from by a breeze coming from somewhere, so air is probably coming in from somewhere else.
There is a mesh/Velcro window on the bottom left and there are 2 other vents on the left. Problems are that the left side of the tent is flush with the wall. The more air that comes in through them, presumably the more light too (?)
I was actually thinking about taping up the Velcro window from the outside in attempts to decrease the light.
I know putting the ducts right next to each other looks pointless, but the RH got where I wanted it to go.
Will continue to try to balance the variables.

Hows it coming along?

This link helped me a lot when I was doing my planning on building a grow tent or grow box in my case.

[h=1]Calculate the CFM and fresh air duct size of your grow[/h]ACF Greenhouse Exhaust Fans & CFM Calculator

I'm growing on wardrobe box believe it or not. Its around 2'x2'x4.8' I have 2 4" 100cfm 12v axial dual inline exhaust fans that were from an HP Proliant server. Got these bad boys off of ebay for $12 total. One fan is directly attached on the reflector (turns on when lights are on) and the other one is attached outside the box which is attached to exhaust duct (running constantly). I currently have a 400w MH/HPS light running 24/0 seedling, 18/6 veg, and now I'm on 12/12 as I just entered into Flower. I have a I have one 4" passive intake which is located towards the left bottom side of the box and my 4" exhaust is located on the back upper right side of the box. Keeping my intake and exhaust on the opposite sides of the box creates a very nice suction. I have an active air shield in my intake to keep it nice and clean inside. I own 2 Strafforshire pitbull mix that shed a lot, lol. I hardly have to clean my reflector and lights since I have Kenmore air purifier right next to the box which helps to lower dust and odor. Crane humidifier that I picked up on Craigslist for $15. RH in veg was about 60-80% and dropped it now to 40-50% in Flower. For CO2, I have an EZCO2 bag hanging right above the plant. Ever since I put the bag inside, shes been growing like a monster.

Top view of box. RDWC w/ chiller made out of a modified water cooler. I have a 12" fan helping cool down the electronics to help cool down 3 gal res. Water temps are at 65-70F. I occasionally throw in 2 frozen water bottles to help it out when it reaches over 72F. I have insulated my tubing and buckets to help insulate the heat from my closet and when the lights are inside the box. As you can see, there's a bunch of electronics going on causing a lot of heat buildup inside my closet. The temps outside the box are average of 80F which is not so bad considering that I haven't yet turned on my central air. The colder my closet gets, the colder the water gets. I think I need to better insulate my buckets with some thermal insulation on top of the reflective material for my next grow. My inside box temps are 80-85F lights on, 75-80 lights off.

Customized reflector. Attached a 12v axial 100cfm directly onto the reflector. Only turns on when lights are on.

Week 1 Flower

Day 3