The MDB Series of duct mounted centrifugal fans is suitable for supply or exhaust from applications ranging from residential, through commercial, to industrial. Construction Aluminium extruded tubular frame incorporating 4 removable pre-galvanised panels for multi-directional airflow. Acoustically lined inner skin for optimum noise reduction. Backward curved centrifugal impellers. Motors Type - direct-driven external rotor. Electricity supply - single or three-phase to suit a wide range of voltages and frequencies. Bearings - sealed-for-life ball. External rotor motors are fully speed-controllable using electronic or auto-transformer controllers. Internal Thermal Protection Manual - reset type are fitted as standard to external rotor motors. Testing Air flow tests to BS848:Part 1, 1980 and AMCA 210-85. Noise data tests to BS848:Part 2, 1985. Special Features Most three-phase external rotor motors are 2-speed star/delta design. Fan units are light in weight and can be mounted at any angle. |