This high quality Woodlink wood duck house is constructed of durable cedar and built Ornithologically correct. A 1/2" air ventilation gap is provided at the top as well as a drain hole at the base. Assembled in the U.S. By hand with screws (not nails) to withstand temperature changes. Front panel opens easily for viewing or cleaning. Product constructed of re-forested, kiln dried, inland red cedar. Proudly made in the USA.