it's an old hatching trick that was taught to me by my grandparents.....
think of it this way
hot air holds less oxygen that cool air
humid air holds less oxygen than dry air
hatching eggs need more oxygen and so do the chicks
so hot humid air has less oxygen available for the chicks to breathe... that's why a lot of chicks who have been incubated at the perfect humidity will die just before hatch.. because there isn't enough oxygen and they die of carbon dioxide poisoning
by dropping the temperature by 1 degree when you raise the humidity it lessens one of those factors
naturally all vents should always be open.. but especially during hatch when fresh air exchange is more critical
also if you incubate at 99.5
hatch at 98.5
I only drop the temp and raise humidity when the first chicks have internally pipped
edited to add a few spaces.. seems I need a new keyboard with a happy healthy space bar.. lol
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