SPECIFICATION FOR SELF-SUPPORTED WASHABLE PRIMARY PANEL FILTER
Air filters shall be the WASHPAK medium duty, medium efficiency, pleated self-supported washable panel type.
The filter shall be 250/gm2 acrylic coated needled polyester fibre.
The effective filter media area shall not be less than 3,4m2 of media per m2 of filter face area and shall contain not less than 42 pleats per linear m.
Initial pressure drop at 2,5 m/s approach velocity shall not exceed 50 – 60 Pa.
The filter media shall have an average ASHRAE arrestance of 89%
The enclosing frame shall be the PAK FRAME modular type, the components manufactured from corrosion resistant steel with a minimum thickness of 0,5mm.
The PAK FRAME sides shall have returned edges of at least 10mm for extra strength and safety when handled.
The PAK FRAME 90 corner pieces shall guarantee during manufacture that the finished filters are always square.
The inside periphery f the enclosing frame shall be permanently bonded to the media pack with expanded 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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