I have my MHP set up in the corner - Front is open, on side has "fringe" hanging 1/2 way to the floor, and the 2 sides with fabric to the floor with solid wall behind. I had 12 chicks in there. When the chicks get about feathered in about 3/4 of the way (3-4 weeks), they started to sleep on top of the MHP. There is enough room for them all to go under the MHP at that age, but they seem to prefer to be "roosting" on top of it. One day the barn cat followed me in and startled them and they all hid under the MHP, so I know they will all fit at that age, lol.