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Fans selection

Necessity of ventilation


Extra moisture and moulds on walls, stifling air, soot, unpleasant smells – these are the evident signs of insufficient or lacking ventilation. This can be the reason for allergy, asthma, diseases of respiratory tracks and blood system.

Effective and correctly built ventilation system is a vital condition for provision of constant fresh air intake and used air exhaust. And this is you who can participate in its creation after learning the basics only. Make sure yourself how easy it is.

Fan choice and air circulation calculation


Before choosing a fan define its destination, necessary modifications and, what is important, the power (capacity) of the device.

If the fan is set in the bathroom or lavatory, it is quite possible that you will need a timer that makes the fan operate and turns it off automatically even after you have left the room. Humidity sensor will turn the fan on when the level of moisture exceeds the set one. For kitchen or other premises you can use a fan with pull-cord switch for short-term air extraction. 

Along with the above mentioned, the following should be taken into consideration when choosing a fan:

  1. Diameter of the flange that can be installed into your ventilation shaft – 100, 125 or 150 mm.
  2. Volume of the room and air exchange per hour.

In order to calculate the volume of the room, use a simple formula please: Volume (cub.m.)=length*height*width (m).

For different premises there are different norms for air exchange. Some of them can be found below.

Room type Square, м2 Air exchange rate per hour Required capacity, м3/h
Lavatory 4-9 5-9 90-200
Bathroom 8-12 5-9 90-150
Kitchen 8-18 6-12 100-300
Living room/bedroom 12-25 4-8 90-300
Service room, accomodation space 4-8 5-8 90-190

Fan capacity, cub.m/h=Volume, cub.m.* air exchange rate per hour.

So, everything is ready, all the required measurements and calculations are complete – it's time to choose a fan!