Dicky Cabinet Incubator question

[Grassman 52]

To increase humidity levels how do you adjust the vents - top vent open = higher or lower humidity? I have been having problems with the dry winter air getting the humidity levels dialed in. There is a post out there that tells you how to adjust the vents, but I can"t find it.

 

[Grassman 52]

While I was waiting to hear from fellow owners I opened the top vent and closed the bottom - the humidity jumped right up. Now opening up the bottom to dial in where I want it.