I covered my fan with a piece of hardware cloth ( 1/2 x 1 inch grid) attaching it with plastic coated twist ties. It worked great. I replaced these after the covers came and when setting up for lock down. I also swapped out the "gasket" for the electronic board at the same time. I had a chick stick its foot through the floor grate. I cut a piece of window fly screen cloth and put it under the floor grate. The floor grate does not turn but helps hold the screen cloth in place. I used a plastic coated fiberglass type of window screen.
I've had another hatching since these additions and it went very well. No problems what so ever. Humidity worked great too but it was not a "popcorn type" hatching either.
I've had another hatching since these additions and it went very well. No problems what so ever. Humidity worked great too but it was not a "popcorn type" hatching either.