It helps keep the humidity in with the eggs without a lot of condensation dripping down on them. We air our eggs by removing the lid and lifting a corner of the cling wrap about every 3 to 5 days. Once they hit day 45 we remove the cling wrap all together and just pop the lid every day for a few seconds to air them (you'll see a lot more condensation developing at this point as they approach their hatching date).Originally Posted by sho220
