Multi-Directional Box Fans - MDB Series



  • The MDB Series of duct mounted centrifugal fans is suitable for supply or exhaust from applications ranging from residential, through commercial, to industrial.


  • 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.


  • 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.


  • 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.


  Diminsions, mm  
Model MDB A B Kg
350 500 500 30
400 670 670 36
450 670 670 50
500 670 670 58
560 800 800 80
630 800 800 105

  Suggested Specifications

  • The MDB Centrifugal Fans shall be as designed and manufactured by Elta SA and be of the model numbers shown on the schedule/drawings.
  • The backward-curved centrifugal impellers shall be driven by external rotor motors.
  • All models shall be fully tested to BS848 : Part 1, 1980 for air flow and BS848:Part 2, 1985 for noise

  Technical Data




Performance curves shown are based on nominal speeds.   As motor speeds may vary from one manufacturer to another and from one motor type to anaother, it is possible actual fan speeds may differ and, thereby, the performance of the fan.


  Auto Cad


Download AUTO CAD file

Download PDF file


The Multiflow TDE 500 to 710 range consist of fully cased, cylindrical models with circular mounting flanges at both ends and a wired terminal box.


The Mini Centrifugal Roof Fan series are the new type roof extract units available in 2 sizes and suitable for vertical and horizontal installation. The low noise external motor and high efficient backward bladed impeller meets the requirement of efficient ventilation in residential, commercial and light industrial applications.

Future 150

The Decor Series can be wall or ceiling mounted and is designed to exhaust stale and moist air from bathrooms, toilets, laundries etc. They are also suitable for ventilating all types of small or closed areas.

TD Silent

The Silent Series is a low profile mixed-flow in-line fan that produces low noise when in operation. It does this through a specifically designed perforated internal skin that directs sound waves produced inside the fan to a layer of sound absorbent material.


The low-profile TD-EVO 250 and 315 in-line mixed-flow fans for circular ducts have a unique design where the support bracket allows the motor and impeller assembly to be fitted or removed without dismantling the adjacent ducting.


AMS started trading late in 1994 ...


Our Partners

Kruger products are licensed to ...

Our Partners

Company Profile

Air Movement Supplies ...



AMS marketing ...



ISO, EC etc ....



CTN, JHB & DBN news ...