Cassette Filters
Commonly used filters for pre-treatment
Cassette filters are most frequently used as the first filtration level in air conditioning and ventilation units. Our technical potential enables us to produce filters using a minipleat filter medium (to increase filter surface) or lying flat. Depending on the dimensions of the filter, additional bars are installed. The unit is branded with a dimension label to help to identify the product properly.
Standards
Cassette filters are manufactured to standards:
ISO 16890
PN EN 779:2012
Fire rating:
F1 wg DIN 53438
Standard dimensions
Frame made from galvanized sheet metal, plastic or cardboard:
592 x 592 mm
287 x 592 mm
625 x 500 mm
Frame thickness:
20 mm, 25 mm,
50 mm, 96 mm, 100 mm
BWF Envirotec manufactures non-standard dimensions upon request or according to drawings and specifications of our customers.
Materials
Arrangement of polyester or polypropylene fibres with a progressive structure guarantees a minimum ratio between filter efficiency and resistance.
Construction
Cassette filters - media lying flat
A filter frame made of galvanised sheet steel guarantees long-term corrosion resistance. A filter medium is positioned between two meshes made from galvanized sheet steel.
Meshes enable stabilization and proper functioning of the filter medium. The frame is closed with a blind rivet.
Cassette filters - pleated material (z-line)
A filter frame made of galvanised sheet steel guarantees long-term corrosion resistance. The filter medium is pleated by machine on galvanised sheet steel mesh. The mesh enables stabilization and proper functioning of the filter medium. The frame is closed with a blind rivet and inductively welded.
Technical data cassette filters
CLASSIFICATION ACCORDING TO THE STANDARDS OF PN – EN 779:2012 | G3 G3 | G4 G4 | M5 M5 | |
FILTRATION EFFECTIVENESS ACCORDING TO ISO 16890* | % | G3 COARSE | G4 COARSE | M5 ePM10 35-70 |
Frame dimensions | mm | G3 592 x 592 | G4 592 x 592 | M5 592 x 592 |
Construction | G3 flat or pleated, depending on the thickness | G4 flat or pleated, depending on the thickness | M5 flat or pleated, depending on the thickness | |
Airflow | m³/h | G3 2500 | G4 2500 | M5 2500 |
Initial pressure drop | Pa | G3 20 - 45 | G4 30 - 55 | M5 50 - 75 |
Recommended final pressure drop | Pa | G3 250 | G4 250 | M5 450 |
Max. permissible operating pressure | °C | G3 plastic frame 80; metal frame 100 | G4 plastic frame 80; metal frame 100 | M5 plastic frame 80; metal frame 100 |
Frame thickness | mm | G3 6 - 100 | G4 6 - 100 | M5 6 - 100 |
Application
- G2, G3, G4, M5 – used in air-conditioning and ventilation units in rooms with average requirements of air purity e.g.: hotels, office buildings, shopping centres etc.