Abstract: In a paint spraying booth having a fresh air inlet at one end and an exhaust at the other end, the inlet end is provided with a solid end wall and a filtering wall parallelly spaced therefrom. Through the ceiling of the booth and in the region between the end wall and the filtering wall, one or more air-inlet vertically-disposed pipes is coupled. The lower end of the pipe terminates within the booth and between the end wall and the filtering wall while the upper end extends several feet upward above the ambient dust and dirt in the atmosphere. At the exhaust end, a pair of doors are provided and on each side of the doors are vertically disposed compartments having vertical filtering walls and being coupled to an overhead duct to expel the air into the atmosphere.