AIRFLOW RATE 

  • Defined as the air volume required to be extracted or supplied into a room during a given period.
  • Several methods can be used to calculate the required airflow:

CHOICE OF FAN 

The fan selection must consider parameters such as:

  • Type of premises - industrial, commercial, domestic
  • Nature of the air and its characteristics - clean air, air & dust or grease, special fluid (gases)
  • Nature of the installation - supply and extract, wall fan, roof fan, ducted systems, position of the air entries, particular conditions
  • Requirements of air flow and pressure drop
  • Acceptable sound level in the room and externally
  • Type of mains supply - single phase, three phases, voltage, frequency
  • Other parameters may be considered for the selection such as dimensions, speed controllable motors, mounting accessories etc. 

THE FAN LAWS

  • These laws enable you to change the aerodynamic parameters:

CONVERSION TABLE

PRESSURE DROP

  • To obtain airflow in a ducted system it is necessary to overcome the resistance of the system:

           - due to friction in the duct length
           - due to the features of the system (bends, cross-section changes, filters, louvres etc.).

  • These losses must be calculated accurately to select the correct fan and to give the airflow required

SOUND LEVEL

  • In the catalogue, the sound level specified in the performance guide is a pressure level generally measured at 1,5 metres from the inlet for centrifugal fans, and at a distance equal to 3 times the impeller diameter (with a minimum of 1,5 m) for the axial flow fans.
 
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TDE

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.

RVF

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.

NEW!! TD-EVO

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.

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