Abstract: An apparatus for cleaning the air from a paint spray booth by removing paint particles entrained therein in which water flows across downwardly converging bottoms walls of the booth through a nozzle extending substantially the entire length of the booth to prevent paint from adhering to them. To improve efficiency and insure the water prevents adherence of paint particles, the nozzle has a rounded entry. The water is atomized and mixed with the paint particles in a restricted section of the nozzle which is connected to the entry by ledges which direct the water across the inlet of the restricted section to improve atomization and mixing of the water and to minimize the noise produced by the operation of the nozzle. The mixture is discharged from this nozzle through a restricted orifice at a high velocity to impinge on a pool of water below the nozzle which separates and removes particles of paint from the air.