WiPa conveyor blowers type WRTG are used for pneumatic conveying of crushed plastic material. Unlike the conveyor blower type WTG, the conveyor blowers type WRTG are equipped with a belt drive, which transfers the drive line of the motor to the impeller. The WRTG type is used, for example, in washing plants where moist materials are to be transported pneumatically. Since the drive unit is separated from the impeller by a belt drive, water cannot enter the motor. The bearing unit of the impeller is protected against the ingress of water and impurities. A generously dimensioned maintenance door enables the simplest cleaning and maintenance work.