2.1 Air Filter Element
A filter unit to clean air from particulate contamination comprising filter material including framing, supporting parts and gaskets, the total to be inserted into a filter housing device.

2.2 Performance Data
Single values out of the filter test report as carried out in accordance with EN 779.

2.3 Product Group
A product group is characterised by the following:

• the same filter material
• the same basic construction (e.g. pocket filters, rigid pocket filters or flat sheet etc.)
• the same or lower media velocity : rated air-flow / min. net filter area; (does not have to be published, for info to EUROVENT CERTIFICATION only)
• the same filter class F5, F6, F7, F8 or F9
• published data available about: basic construction, filter media, filter class available via internet or other published sales brochures.

2.4 F-Filter Class: Class of fine air filters based on classification according to EN 779.

2.5 Initial Pressure Drop: Pressure drop of a new filter at the rated air-flow

Verification of performance characteristics shall be carried out in accordance with the European Standard:

EN 779.2002 or subsequently superseded:
"Particulate air filters for general ventilation - Determination of filtration performance - without Annex A (discharge)."

The following performance characteristics shall be certified:

• Filter class: F5 up to F9
• Initial pressure drop ∆p0 in Pa, measured according to EN779 page 12/13