Ok I built this to hold a lot of egg turners but the vent pipes are in the way. I forgot about that. But for 2 turners to fit on one shelf you have to take a grinder to the end of the turners and remove 1/2" off of each. I'm going to modify this and run my tubing out side of the egg box. Also mine is out side and needs to be cleaned I will bring in in for any new hatchings. I lost 4 racks of eggs in my last hatching from it being out side during the summer.