hi I have this coop it was a mistake to buy this your suppose to put wood chips but when you clean it out the wood chips don't stay on the tray it falls to the floor which defeats the purpose of the tray... so what I do now is I put down brown paper bags like the ones you would get at Whole Foods and then at the end of the week I would replace the brown bags with clean ones and yes they is no ventilation in there and when it rains its gonna get wet on the inside so I would recommend getting a tarp to put on the coop when it rains. I really hope that your next box doesn't fall apart or get mold bc mine does