Abstract: A spray booth for collecting excess electrostatically sprayed powder. A powder coating chamber is formed by a plurality of interconnected walls spaced apart and mounted to a plurality of outer interconnected walls. A pressurized gas chamber positioned between the inner and outer walls is connected to a source of pressurized gas. The inner walls include a plurality of louvers allowing the pressurized gas within the gas chamber to escape into the powder coating chamber and flow parallel adjacent the inner walls preventing contact between the inner walls and excess electrostatically sprayed powder. The vertically extending inner side walls include louvers which extend into the pressurized gas chamber and upwardly towards the top inner wall causing the pressurized gas escaping through the inner side walls to flow downwardly toward the bottom wall.