WPA-P-N/Ex stationary fans have been developed for use in the areas of explosion hazard, where explosive atmosphere (i.e. mixture of flammable compounds in the form of gas and vapour with the air) is likely to occur. Increased fan pressure make them particularly efficient within installations of local exhausts, filtering units and also within the system of significant flow resistances. The fans can be operated within the range of temperatures –20°C up to +40°C. They are efficient in forwarding the dry air, of dustiness not exceeding 0,3 g/m³, without viscous contamination, aggressive compounds and of maximum temperature +60°C.