Air filtration filter bag Taschenfilter

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Product overview
Pocket filters 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.

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. Pockets are 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 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 methods 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.

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

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

Technical data (pocket filters)
Table representation (key rows):

Classification according to PN EN 779:2012

• G3, G4, M5, M6, F7, F8, 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
Most classes: 592 x 592 mm

Airflow
Typical: 3400 m3/h (per 592 x 592 unit, reference value shown on page)

Initial 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 / G4: 250
• M5 / M6 / F7 / F8 / F9: 450

Max. permissible operating temperature
Plastic frame: 80 °C; Metal frame: 100 °C

Pocket length
200, 300, 360, 500, 600 mm

Number of pockets
Typically 6 or 8 pockets depending on configuration

Applications

• G2, G3, G4 – ventilation and air-conditioning systems in spaces with average air cleanliness requirements (e.g. hotels, offices, shopping centres)
• M5, M6, F7, F8, F9 – ventilation and air-conditioning systems in spaces with high air cleanliness requirements (e.g. hospitals, food industry, electronics)

Notes
*Final results are given in the offer or when ordering.

Characteristics / technical specifications

• Brand: BWF Envirotec
• Commercial name: Pocket filters
• Frame material: galvanised sheet steel (metal frame) or black plastic (plastic frame)
• Filter media: synthetic polyester or polypropylene fibres
• Standards: ISO 16890; PN EN 779:2012
• Fire rating: F1 wg DIN 53438
• Standard frame sizes: 592 x 592 mm; 490 x 592 mm; 287 x 592 mm; 287 x 287 mm
• Frame thickness: 20 mm, 25 mm
• Pocket lengths: 200 / 300 / 360 / 500 / 600 mm (standard)
• Number of pockets: typically 6 or 8
• Airflow (reference): 3400 m³/h (for 592 x 592 mm reference)
• Initial pressure drop (Pa) by class: see table (e.g. G3: 18–55 Pa; F9: 110–195 Pa)
• Recommended final pressure drop: typically 250 Pa (G classes) or 450 Pa (M/F classes)
• Max. operating temperature: plastic frame 80 °C; metal frame 100 °C
• Mounting/assembly: pockets sewn, mounted on steel wires with temperature-resistant industrial adhesive; side seals filled with technical foam