Apparatus for cleaning contaminated surfaces by means of flowing air

Pass-through station for conducting an air flow and for cleaning contaminated surfaces in the station with flowing air, comprising a passageway for conducting an air flow having a substantially circular air flow cross section, a central axis, oppositely disposed segmental side walls and oppositely disposed end surfaces defining a given height of said passageway therebetween, air chambers alongside said passageway having segmental inner walls forming said oppositely disposed segmental side walls, said inner walls of said air chambers having at least one pair of slit-like air outlets formed therein diametrically opposite one another with respect to said central axis and extending over substantially all of said given height, and incoming air chamber connected in common to said air chambers, means disposed in said air chambers for evening out air outflow velocities from said air outlets over substantially all of said given height, and at least one return air pipe coaxial to said substantially circular cross section at least at one of said end surfaces.