I leave my vents open on my incubator.
Why did you decide to incubate at 50% humidity? I'd do 35-45% max.
@MGG @CluckNDoodle vents? humidity for NR360?
For me personally, it's vents wide open and I aim for 45% humidity as a sweet spot in the NR360s for optimal hatches with little to no adjustment to humidity when monitoring weight or air cell development but I have successfully hatched in the NR360 following the instructions as well, I just fiddled with it over time.