Specification For Dualpak Cartridge Filters Types 85


Air filters shall be the DUALPAK heavy duty, pleated cartridge type
size 595 x 595 x 295mm


The filter media shall be genuine WIRECOR progressive efficiency type comprising a first stage of 200g/m2 acrylic coated needled polyester fibre mat followed by a second stage of lofted 100% spunbond polypropolene layed on a polypropolene carrier to prevent fibre migration, which shall allow full depth dust loading negating the face loading tendency of most continuous efficiency media.

The first and second stage medias shall be permanently bonded together by hotmelt coated 1,2mm diameter galvanized wire spaced at intervals of no more than 50mm by the WIRECOR media manufacturing process.

The lateral internal heavy duty wire support when pleated shall keep the pleat in shape and prevent pleat vibration and collapse, a tendency of unsupported media filters under high airflow conditions.

The effective filter media area shall be not less than 5m2.

Initial pressure drop at an air volume of 0,9m3/s shall not exceed 80 Pa with a recommended final pressure drop of 300 Pa.

The filter media shall have an average ASHRAE efficiency of 80 – 85% and an arrestance of 99%


The enclosing frame shall be manufactured from corrosion resistant steel with a minimum thickness of 0,6mm.

The frame can be either the single header type or the box type and the header dimensions will be 595 x 595 x 20mm.

The inside periphery of the enclosing frame shall be permanently bonded to the media pack with urethane thus eliminating the possibility of air bypass.

A permanent identification and airflow direction label shall be affixed to the filter frame.

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