These are becoming less and less popular because the space used for air intake
systems in modern passenger cars has been significantly reduced due to the
installation of many additional systems (e.g. air conditioning). Circular filters with
a complex structure, are popular in high-capacity premium vehicles
Panel filters with cellulose blotting paper
Panel air filters with cellulose blotting paper are installed in most of today's models
of passenger cars and light commercial vehicles. The technology of producing
these filters is complicated due to the need to use, in many cases, elements
increasing the rigidity of the filter pleats.
Panel filters with synthetic non-woven fabric
Synthetic non-wovens have very good filtration properties, but are less rigid than
cellulose blotting paper. To ensure the proper stiffness of synthetic non-woven
filters, the filter medium is placed in a plastic frame created by injection moulding.
Additional reinforcement can be provided by a special plastic mesh, which also
protects against damage during operation.