Whole exposure module composed of the basic CULTEX^® module and the exposure top with the aerosol supply system integrated into a rack system functioning as a locking device. The exposure top can be fitted tightly to the basic module, thus realising a close connection between the two parts before exposure. The basic module houses three culture inserts, which can be separately supplied with medium by a computer-controlled pump. If required, the module can be fitted with an electrostatic device for efficient and complete particle deposition.