I have an incubator I built that regulates the temperature to 99.5 (though not sure of the sensor accuracy). I have some water reservoirs and can keep humidity anywhere between 38% and 52% (same unknown on accuracy). I could probably go lower on humidity if I let the water run dry, and probably will after reading the threads. I read several threads with 'ventilation' in the title, but there was no discussion of just ventillation. It always came back to temperature and humidity. My question is if ventillation matters and if so how? if the reason is to control humidity, then I have that covered, and can ignore ventillation. My incubator has minimal ventilation. It has some holes for wire egress and the lid just sits on top, with no gasketing or sealing.