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.
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.
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.
Cassette Filters with thermosetting pleat
without steel mesh
In response to the market needs, we introduce a new technical solution for cassette filters to our catalogue – the innovation based on the elimination of the steel mesh from the filter structure.
Cassette filters are the most frequently used filters of the first stage filtration in air conditioning and ventilation units. The new technical solution enables non-woven filter fabric to be pleated with the use of thermal treatment, which results in a stiff pleat placed in the filter frame. This design enables the elimination of the steel mesh as an additional filter frame. Thanks to this, we obtain less weight and a larger filtration area while maintaining the highest quality parameters of the filter.
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 |
*final results are given in the offer or when ordering
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.
