Casing
Plastic Casing
The housing of the RK tube fans is made of a a sturdy and flame redardant light grey plastic material and is fitted with an integrated terminal box and guide vane.
Steel Casing
Casings of sizes RS 100-355 and ERM / DRM 315 - 500 are made of powder coated sheet metal.
Impeller
Backward-curved centrifugal impellers made of sheet steel or plastic. The impellers are fitted directly onto the external rotor motor. The motorized impeller unit is balanced in two planes to quality level G 2.5 (DIN ISO 1940).
Motor
WOLTER tube fans are driven by an external rotor motor of protection class IP 44, fitted within the radial impeller. The electrical connection is according to VDE 0530, insulation material class B with additional moisture impregnation. From size RK 150 up to size 315, all units are equipped with thermal contacts inserted in the motor winding. Fans are delivered ready for installation in individual boxes.
