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The ventilation is not used to control humidity in a cabinet incubator, if your humidity is too low add a sponge or two to your water tray, teh ventilation is critical proper temp balance and fresh air for the developing eggs.
Hope that helps, it will dramitically improve your incubation and hatching success.
With the automatic bucket the humidity stays the same unless it rains. The incubator had a small tray with float in it, the humidity was always too low! Ordered the newer tray & then I struggle with the humidity being too high, since the new trays are larger. Since I have the larger pan the humidity stays @ 45%. I keep the 6 vents open about 50% should I open them more? When the humidity was real high in the air-- mid august. I had the vents opened all the way & that help keep my humidity down.
Unfortunately it is impossible to tell you which vents to open or close down, it is completely based on where the incubator sets, how close it is to walls (that affects air flow), and what the environment is where the incubator sits.
if it were me, i would take and measure the temperature in each tray, monitor what th ehigh temp is, and what teh low temp is in each tray, write down teh results for each tray. Open the fresh air intake all the way, then re-measure all the trays, adjust the exhaust vents one at a time measuring tray temps each time you make an adustment, allow at least 30 minutes between making an adjustment and measuring the temperature.
Do not adjust the temperature during this process the goal is to get all the trays in balance.
Once the ventilation is set all teh trays will have the same temperature, same rise and drop.
Set the inc. temperature at that point allow at least 30 minutes from making a temp adjustment and checking to see if you need to re-adjust.
Once temp is set you will likely have humidity without any sponges around 30-35% possibly a bit higher based on where teh incubator is, wash rooms and bathrooms are always more humid.
Incubation humidity I have my best luck between 45-47% and hatch around 75%.
I have walked several thorugh this process and everyone gets a better hatch and more balanced incubator when done but it does take a full day to get the ventilation alone set right.
I use a HVAC thermometer for this it is accurate to 1/10 of a degree and takes a new reading every 2 seconds, you can listen to incubator to know when teh lement is coming on and going off. This is a lot of work but you only need to do it once so long as you are not moving your incubator. I do the same thing with our hatcher which is an old redwood leheay manufacturing built back in the 40's and I have it dialed in to less than than 3/10s of a degree temp swing and all trays perfectly even on temp and temp swing.