Abstract: A spraybooth for use, for example, in spray painting motor vehicles has an air supply duct 11 which extends centrally along the length of the top 5 of the booth and has an air supply opening 12 fitted with a cloth filter 16 in its underside. The opening 12 extends from near one end 1 of the booth right up to the outer end 2 and is supplied with air by a fan 9 from the one end of the booth. A single air outlet opening 17 is provided at the middle of the bottom of the one end 1 of the booth and is connected to an air extraction fan 21. The velocity head of the air flow from the air supply fan 9 decreases along the length of the air supply opening 12 from the one end 1 to the other 2 and accordingly the pressure head increases so that the downward air flow from the filter cloth 16 per unit length of the air supply opening decreases from the one end 1 to the other end of the booth 2.