Mini Pleat Filters
Mini pleated filter packs are made by pleating paper filter media and securing it with a adhesive bead to secure pleat spacing. Mini pleat media packs can be as thin as 1", but the most common variety is 2" thick. The packs are sealed into a frame and are often set up in vee shaped banks which increase the filter media that can be packed into one filter.
Advantages to this type of filter are that they are rugged and the mini pleat filter media packs resist puncture, the increased media in the filter allows a long life and decreases the pressure it takes to push air through the filter [pressure drop].
Note that the Purolator Dominator is the newest version of this filter media type of technology. It takes even less pressure to push air through this filter and further increases the lifespan of the filter.
KOCH Filter DuraMax
Purolator Dominator
Purolator Serva-Cell
Purolator Ultra Cell V HEPA Filter