Wall fans – type WO-S are adapted for wall mounting and are used for forced air exchange. As a standard, the air flow takes place from the motor towards the impeller (A), optionally it is possible to make a fan with the flow from the impeller towards the motor (B), as well as the version with the reverse impeller (R), enabling operation in both directions with the same efficiency. Wall fans type WO-S consist of an aluminum housing, impeller and a special SIEMENS electric motor. The motors used are adapted to operate at temperatures up to + 40°C (optional up to +60°C) and to be adjusted by means of a frequency converter (inverter), made in insulation class F, 400V, 1400 rpm. or 2800 rpm. WO-S fans are easy to install and maintain. They are widely used in various industries for ventilation purposes, where large amounts of air should be transported at low pressure. They can easily be mounted on the wall at any height for better airflow. They are solidly made and are a desirable component in air pollution systems in various industries.