Wall-mounted fan ER/DR

high-performanceaxialventilation

• asynchronous external rotor motor • small depth • universally usable in all installation positions • speed is variable using auto transformers Casing The casings of the high-performance axial fans are manufactured from galvanised sheet steel and get an electrostatically applied powder plastic coating. model EQ/DQ: with square wall plate model ER/DR: pipe sleeve with double-sided standard flange for pipe installation Impellers The high-performance axial fans have aerodynamically shaped blades: size from 200 to 300 made of painted and galvanised steel sheet size from 315 to 630-6 made of plastic size from 630-4 to 1000 made of die-cast aluminium The impellers or blades are mounted directly on the rotor 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. Motors size from 200 to 300 motor protection class IP44 size from 315 to 1000 motor protection class IP54 External rotor motors are used with moisture protection, with built-in ball bearings, and are designed with thermal overload protection. The drive by the external rotor motor provides a space-saving, compact and attractive design. The motor sits inside the impeller and is thus optimally cooled. For this reason, a 100% variable speed control can be guaranteed. Only well-dimensioned ball-bearings, fitted on both sides and with a long-life lubricant, are used. Both ball-bearing seats are ground to high precision in one work step to eliminate any vibration. External rotor motors are also characterised by an extremely low starting current.