Centrifugal fan R

ventilationsteelaluminum

• steel casing • backward curved impellers • can be used in all mounting positions • speed is 100% infinitely variable using auto transformers or electronic control Casing The casings are made of galvanised sheet steel. Impellers Up to size 315L, backward curved high-performance impellers made of plastic are used, from size 355, backward curved, high-performance impellers made of aluminium are used. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11. Size 100 - 250 backward curved high-performance impellers made of plastic Size 250L - 315M backward curved high-performance impellers made sheet steel Size 355 backward curved high-performance impellers made of plastic Electrical connection The electrical connection is made through a terminal box mounted on the casing with protection class IP54. Assembly Rigid folded spiral-seam tubes (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Rosenberg tube fans can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.