Consisting of a breathing protection fan, particle filters, a pressure relief valve, an air supply hose, a carrying device, a breathing air hose and a full mask, fresh air suction hose devices are self-contained breathing protection devices and are mainly used in contaminated or low-oxygen working areas. There the use of normal filter respiratory protection or compressed air respiratory protection is not possible. The required breathing air is led through the fresh air pressure hose devices from an area outside the contaminated ambient atmosphere via an air supply hose to the breathing connection.

Fresh air suction hose devices are divided into two classes:
Class 1: Devices with light mechanical load capacity
Class 2: Equipment with heavy mechanical load capacity