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.

Air conditioning filters of BWF Envirotec, Poland at a glance

Contact persons worldwide

Do you have questions about our products?
Contact us for more information

Your personal contacts at BWF Envirotec

Do you need further information about specific products?

Request product brochures here