The air that surrounds us is composed of a variable mixture of different gases, in which solid particles are also dispersed. Their diameter varies in a range between 0.1 and 100 µm and they can be classified as substances of mineral, vegetable, animal matrix or as microorganisms. This category also includes the famous "pollution" particles that we often hear about: PM10, PM2.5, PM1 ... The fine dust filters act as a barrier to all these particles

Fine dust filters: how they work

The fine dust filters used in an air conditioning system intercept the particles present in the air flow. The efficiency of the filter is the result of many factors, including the particle size and their concentration in the air flow, while the dust retention capacity depends mainly on its geometry and size

The filter element must be replaced when it reaches its saturation; this occurs when the accumulated particles increase the pressure drop of the filter beyond the maximum values ​​recommended for its replacement indicated on the technical data sheets. Generally, for replacement, a final value of the pressure drop equal to 3-4 times the initial value is considered

Fine dust filters: types

Fine dust filters can be rigid bag, soft bag or panel type:

  • Rigid bag filters: they are characterized by a series of panels arranged in a V shape to have a large filtering surface. The media is made of pleated glass microfiber paper
  • Soft bag filters: a series of synthetic fiber or glass fiber pockets are mounted inside the frame. The depth of the filter is variable but still limited compared to rigid pockets
  • Panel filters: compact in size, they are made with a pleated glass microfiber paper panel. The filtering surface is very small