Pocket Filters
The most frequently used filtering element in ventilation systems

Filter pockets are produced in a metal or synthetic frame. The number of pockets depends on the technical aspects of ventilation systems. The raw materials used in the production process, filter medium and production technology guarantee proper filtration properties and feature a long service life (as desired by customers).

Standards

Pocket filters are manufactured to standards:

  • ISO 16890

  • PN EN 779:2012

Fire rating:

  • F1 wg DIN 53438

Standard dimensions

Frame sizes in pocket filters are fully standardized. The most popular are:

  • 592 x 592 mm
  • 490 x 592 mm
  • 287 x 592 mm
  • 287 x 287 mm

Frame thickness:

  • 20 mm, 25 mm

Pocket length:

  • 200 mm, 300 mm, 360 mm, 500 mm, 600 mm

BWF Envirotec produces non-standard dimensions upon request or according to a sent format.

Materials

The arrangement of polyester or polypropylene fibres with a progressive structure guarantees a minimum ratio between filter efficiency and resistance.

Construction

Pocket filters in metal frame

A filter frame made of galvanised sheet steel guarantees long-term corrosion resistance. Filtering pockets stitched with industrial sewing machines ensure a long-term bond. Mounted in the frame on steel wires glued to the frame with temperature resistant adhesive. Depending on the dimensions, the in-curved edge of the wire ensures proper adherence to the frame and prevents it from slipping off and coming unglued. The sides of pocket packages are stuck to the frame and sealed with technical foam which guarantees a proper sealing.

Pocket filters in plastic frames

The filter frame is made from black plastic. Pockets are joined together with a specially designed profile made from plastic using a pneumatic machine or sewing machines. Both of them provide suitable adhesion and fitting in the filter frame. The sides of pocket packages are stuck to the frame and sealed with technical foam, which guarantees proper sealing.

Technical data pocket filters

CLASSIFICATION ACCORDING TOTHE STANDARDS OF PN – EN 779:2012
G3
G3
G4
G4
M5
M5
M6
M6
F7
F7
F8
F8
F9
F9
FILTRATION EFFECTIVENESS ACCORDING TO ISO 16890*
%
G3
COARSE
G4
COARSE
M5
ePM10 35-70
M6
ePM10 60-80
F7
ePM1 40-65
F8
ePM1 65-90
F9
ePM1 80-90
Frame dimensions
mm
G3
592 x 592
G4
592 x 592
M5
592 x 592
M6
592 x 592
F7
592 x 592
F8
592 x 592
F9
592 x 592
Airflow
m³/h
G3
3400
G4
3400
M5
3400
M6
3400
F7
3400
F8
3400
F9
3400
Intitial pressure drop
Pa
G3
18 - 55
G4
22 - 65
M5
45 - 65
M6
55 - 95
F7
90 - 140
F8
95 - 175
F9
110 - 195
Recommended final pressure drop
Pa
G3
250
G4
250
M5
450
M6
450
F7
450
F8
450
F9
450
Max. permissible operating temperature
°C
G3
plastic frame 80; metal frame 100
G4
plastic frame 80; metal frame 100
M5
plastic frame 80; metal frame 100
M6
plastic frame 80; metal frame 100
F7
plastic frame 80; metal frame 100
F8
plastic frame 80; metal frame 100
F9
plastic frame 80; metal frame 100
Pocket length
mm
G3
200, 300, 360, 500, 600
G4
200, 300, 360, 500, 600
M5
200, 300, 360, 500, 600
M6
200, 300, 360, 500, 600
F7
200, 300, 360, 500, 600
F8
200, 300, 360, 500, 600
F9
200, 300, 360, 500, 600
Number of pockets
pcs
G3
6 or 8
G4
6 or 8
M5
6 or 8
M6
6 or 8
F7
6 or 8
F8
6 or 8
F9
6 or 8

Application

  • G2, G3, G4 – in ventilation and air-conditioning installations of rooms with average air purity requirements, e.g. hotels, office buildings, shopping centres, etc.
  • M5, M6, F7, F8, F9 – in ventilation and air-conditioning installations of rooms with high air purity requirements, e.g. hospitals, food and electronics industries, etc.

Air conditioning filters of BWF Envirotec, Poland at a glance

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