General Purpose Bag Air Filter G3 – G4 to EN779

General Purpose Bag Filter are available in low to medium efficiency grades and are used in heating, ventilation systems and air conditioning systems (HVAC), and kitchen extract systems. Bag Filters are manufactured from a high lofted non woven synthetic material with a galvanised header frame this filter offers higher air flow rates and a greater dust holding capacity than a panel filter.

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Data Sheet

What size is your General Purpose Bag Filter?

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General Purpose Bag Air Filter Applications

A G4 Grade General Purpose Bag Air Filter is a medium efficiency multi-pocket synthetic media bag filter providing low resistance combined with high dust holding capacities.

Low grade G3 Pocket Bag Filters are generally used as a pre-filter for higher grades of air filtration, or for use as a simple filter for general applications.

General Purpose Bag Filter Construction

The HVAC Bag Filters pockets are produced from thermally bonded polyester fibres that are specifically designed for air filtration. The pockets are retained in a rigid galvanised steel channel.

The G4 Bag Filter is available in a range of standard sizes and pocket lengths and can be manufactured in non standard sizes to suit most applications.

Max Temperature: 100°C

Max Humidity: 100% RH no free moisture

Dimensions to pocket ratio guide

Header HxWxD Actual size in mm No. of Pockets
592x592x20mm 6
592x490x20mm 5
592x287x20mm 3

Sizing a Bag Filter

Bag Filter Sizing Diagram for General Purpose and High Efficiency Bag Filter

What do we need to know when you call or email us to order or inquire about bag filters?

When ordering a HVAC bag filter, the information we need from you is:

  • Height of the bag filter
  • Width of the bag filter
  • Depth of the metal header
  • Length of the Pockets
  • How many pockets there are

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Low Grade Pocket Filter Performance Guide

Average efficiency EN 779 Rating Filter Depths Rated Airflow Initial Resistance Final Resistance Average Arrestance
G4 300mm (12″) 0.9m3/s 50pa 200pa 80-90%
G4 450mm (24″) 1.4m3/s 50pa 200pa 80-90%
G4 600mm (18″) 1.6m3/s 50pa 200pa 80-90%

The above information is based on a full sized filter 592x592x20mm

Alternative: High Efficiency Bag Filters

High Performance Bag Filter Grades M5-F9 to EN779 air filters
High Efficiency Bag Filter Grades M5-F9

For medium to fine (M5-F9) filtration check out our high efficiency bag filter range.