Apparatus for applying paint to mainly flat parts

An apparatus for painting flat products including a spray booth, in turn including a plenum having two opposite ends and a central portion, a conveying belt for conveying products, at least one device for applying paint, and at least one suction plant,

• wherein
• the plenum of the spray booth has a symmetric M-shape portion including in each half of the M-shape portion, from one respective end to the central portion of said plenum in sequential order:
• an external first surface portion ascending from the one respective end and tilted inward;
• a lateral second surface portion parallel to the conveying belt;
• a central third surface portion, descending to the central portion with a tilt opposed to that of the external first surface portion;
• and
• the central portion which comprises a central fourth surface portion parallel to said conveying belt, which is closer to said conveying belt than the lateral second surface portion.