Product category
Pocket filter
Pocket filters, or envelope filters, are characterised by their deep pockets. The deep filter pockets work well in larger industrial and residential ventilation as the filters can collect more particles. The number of pockets and the dimensions of the filter depend on which manufacturer and model the filter fits.
At Danfilter, you can find pocket filters in filter classes G3 up to F9. It is entirely up to you how high a filtration you want. For most ventilation units, the G4 standard filter class is enough to collect particles as dust.
If you want your filter to be able to collect finer particles, the filters in class F7 and F9 will be best.