Quote: x2 I dont have a still air, but def keep all the vents open. I am actually unplugging my fan for hatching this time in the coolerbator, I do worry about keeping humidity up in a still air one though, but only time will tell for us how much that fan helps or doesnt help with humidity, I will let you know about that one. My styro bator I use to hatch in has tiny holes in the bottom, top and then those two large red vent plug holes, I am ALWAYS KEEP all vents open for the entire hatch! Ventilation is just as important to the embryo as the chick as its hatching. I honestly love our coolerbator! love love it!