Help with fans in my grow box...

I have a small grow box. I have 2 120mm computer fans. I have 1 fan at the top of the box for air exhaust. I have 1 fan in the side of my box for air intake. I am having trouble with very low humidity like around 20%. I have temps at 72 - 78. I am using CFLs for lighting. I am trying to find a way to raise the humidity. So I was wanting to know if I should shut a fan down, if so which fan should I shut down? The exhaust or intake?

only way to increase humidity is to:

A: add humidifier like a vicks or fogger.
B: increase watering amounts and slow down fans a bit.

other then that its all about finding the sweet spot.

too much fan will dehydrate your soil, and move the humid air out too quick.. but your setup is like a microgrow.. pointless, but fine and hopefully beneficial to your habits

boneynerd said:

only way to increase humidity is to:

A: add humidifier like a vicks or fogger.
B: increase watering amounts and slow down fans a bit.

other then that its all about finding the sweet spot.

too much fan will dehydrate your soil, and move the humid air out too quick.. but your setup is like a microgrow.. pointless, but fine and hopefully beneficial to your habits

Click to expand...

Agree!!
But you could try to remove the intake fan and put it up with the outtake fan, this will slow down the airflow and will result in the humidity increasing. Also a bowl of warm water in the box will help at this point.

I used a bucket half full with water with a towl hanging in the water and over the bucket edge for my tent recently.
The same could be downsized, half cup of water, and a piece of cloth hanging in the water and over the edge.