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Your guarantees, our certifications

SODISTRA is committed to a proactive certification policy to provide you with even more guarantees.

Filter bypass leaks

Standard: NF EN 1886: 2006
Ventilation of buildings - Air handling units - Mechanical performances

Role: To assess the air leak level around the filtering cells as well as leaks from the exterior to the interior upstream of the filter.


The air bypass around the filter cells reduces the effective output of the latter because the bypass air is not filtered. Sodistra has performed the tests on its air handling units, for which we are classified at the highest performance level by TUV Nord.

Filter bypass leaks, negative test pressure 400 Pa:

Classification Total leak in % Result
Sodistra AHU
F9 0,5 0,38 %
F8 1
F7 2
F6 4