Abstract: A paint booth facility for painting truck cabs and attachments in which electronic robots operating electrostatic paint guns apply successive coats of paint. The object to be painted is indexed through a series of spray booths, flash-off booths and finally curing ovens all of which have a contained atmosphere. The level of volatile organic compounds (VOC) in the paint booth atmosphere is not permitted to exceed 25% of its lower explosive limit but is maintained at a level that is higher than permitted in paint booths that are occupied by humans. A portion of the recirculated paint booth atmosphere is directed to a thermal oxidizer where it is ignited autogeneously, and this portion is replaced by fresh air that has been conditioned.