I would like to know how much ventilation does a home made cooler inci that is approximately 15 x 28 x 16. I have two holes on either side that are 1 1/4 inches that I can open or shut. There are 4 tiny holes in the top, all under 1/8 inch. When I am going into lock down, I will take out the pole for turning them and that leaves two more 1 inch holes. My question is: for the first 18 days, should I have one or two 1 1/4 inch holes open. The first time I used it I opened both the whole time with a 75 % hatch rate. I am expecting some treasured Buckeye eggs and just want to know the skinny on ventilation!