As the quality of the filter is determined by pressure loss and filtration efficiency, the filter quality coefficient Kv has been introduced, this being the relationship of the negative logarithm of the penetration coefficient pF to pressure loss delta p760.
Formula 4.6.4.1
This value represents a material constant for a certain filtration material and depends on the gas throughflow velocity through the filter wo, fibre diameter Df, porosity and other values. Filtration layer thickness, however, remains without influence on this material constant which is determined experimentally.
