Mine is a 8'l x3'w x2-1/2' h wooden crate I hauled home from work. Put a split wire top on it and I can either divide it for smaller chicks or let them have the whole length. The heat lamp starts out hanging from the wire top then goes on top eventually. I usually start with lamps at either end, one inside, one on top. It gives them a range of temperatures to chose from. So far, very successfull.