of the booth 39 s body where paint particles are partially arrested and then part of the air stream containing efl vapors and finely dispersed dry paint particles is extracted through aru 12 to be cleaned and or exhausted to atmosphere while the main air stream goes to fine cleaning filters 24 where additional extraction of finely dispersed paint particles from the return air stream is carried out and then mixes with fresh external air in zone 3 which leads to a decreased efl vapor concentration and finally is further cleaned of dust and paint in upper filters 2 after the filters the uniform mixed air stream is again supplied to the whole area of working zone 4 in said variant internal partition 21 allows additional filters of fine cleaning 24 to be placed in return air treatment unit which significantly improves the degree of air cleaning compared with variant 1 and lengthens the lifetime of upper filters 2 in the painting booth the u201c baking u201d mode variants 1 and 2 is carried out as follows the operator opens by pass aru 19 and closes aru 12 and 18 after finishing the painting process the level of mutual closing of the last two is determined by necessity to maintain some excess pressure in the paint booth body fan 13 starts to work in recirculation mode after completing the above steps sucking air from zone 5 and supplying it through air heater unit 17 to zone.