Easy to assemble. Ventilation holes in partitions for fresh air flow. Removable nest bottoms makes cleaning and litter replacement easy. Double bolted perches are hinged to allow closing. Accommodates 50-60 hens. Hangers are standard. Openings: (12" w 12" l x 7 1/2" h) Nest box: (60"l x 34 1/2" h)