Filter insert

Filter insert

Filter insert and process for producing it

Filter installation device

Filter media

Filter module

Filter orientation ribs

Filter pleat fold spacer

Filter system

Filter system; element configuration; and methods

Filter system; element configuration; and methods

Filter system; element configuration; and methods

Filter system; element configuration; and methods

Filter unit

Filter ventilator

Filter with a filter cassette

Filter with efficiently sealed end

Filter with efficiently sealed end

Filter with improved fatigue performance and torque transfer

Filter with integral structural framework