They are high efficiency filters composed of a series of pockets through which the air to be treated passes. These pockets are made in glass microfibers media supported on the air outlet side by a nonwoven covering, and are properly clamped to a support frame. Strong seams ensure the good seal of pockets. The property of these filters is the high filtering surface (proportional to the depth of the bags and their number).


They are used in air treatment units and ventilation plants either as final filters or as pre-filters to absolute filters in order to make their life longer.


Four different type are available: VH45, VH65, VH85 and VH95. The following table shows the filtration class according to EN 779:2012 and the nominal capacities with the pertaining initial resistance for some standard sizes.


Front dimensions and depth Number of pockets capacity [m3/h] initial pressure drop
VH45 VH65 VH85 VH95
592 x 592 x 535 10 3400 70 Pa 80 Pa 100 Pa 130 Pa
592 x 592 x 635 10 4000 70 Pa 80 Pa 100 Pa 130 Pa
592 x 592 x 735 10 4500 70 Pa 80 Pa 100 Pa 130 Pa
592 x 592 x 915 10 5000 70 Pa 80 Pa 100 Pa 130 Pa
classe di filtrazione secondo EN 779:2012 M5 M6 F7 F8

Capacities comprised between the 75% and the 125% of the mentioned ones are allowed for a good working of filters. Approximately it is possible to consider, inside this range, a linear correspondence between resistance and capacity. The limit working temperature is of 90°C approx.
Filters with different number of pockets, different frontal and/or depth dimensions are available.


It is advisable to foresee a pre-filtration stage before these filters. The LOM-BAG filters can be installed into proper holding frames having frontal access and usually designed to fit any possible pre-filters. It is advisable to replace these filters once having reached a resistance of 250÷300 Pa.


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