The Difference Between G1 G2 G3 And G4 Primary Filters

The primary filter is mainly divided into 4 grades: G1,G2,G3,G4(standard EN779). Different efficiency grades can be used for different application environments and can be made into different styles.

Some Styles Of Primary Filters

Different Grades Of Primary Filters Can Be Made Into Different Styles

Primary filters generally include the above four styles: Metal mesh filter, Nylon mesh filter, Pleated filter, Washable filter.

The Metal mesh filter is generally G1 efficiency, and can be galvanized or aluminum alloy frame. Thickness can be adjusted according to customer requirements.The filter material is expanded aluminum foil mesh. It has the advantage of repeated cleaning and is extremely economical. Can withstand temperature above 250 ℃.

Nylon mesh filter usually uses aluminum alloy frame, filter material is polyamide monofilament fiber braided filter material, wear-resistant, high strength, long service life.

Pleated filter common efficiency is G4, there are cardboard frame, galvanized frame options, filter material is usually synthetic fiber. The surface of the filter material is usually a layer of surface protective mesh to keep the filter material stable.

The fourth picture shows a style of washable filter, usually G3 or G4 efficiency, available in galvanized or aluminum frames. Can be cleaned 2~3 times.

Grade Division Of The Primary Filter

More Details Photos

 Metal mesh filter

The outer frame is usually galvanized frame or aluminum alloy frame, the thickness can be 10mm, 21mm,46mm, etc., can also be customized according to customer requirements.The filter material is expanded aluminum foil mesh. As the whole is made of metal, it has the advantage of being washable and extremely economical. The efficiency is usually G1.
It can be applied to the coarse dust filtration system of general buildings, the primary filtration of industrial grade air ventilation equipment, the ventilation system that requires acid and alkali resistance, high strength and high temperature resistance, and the paint room filtration of the automobile final assembly workshop.

Nylon mesh filter 

Nylon mesh filter is generally made of aluminum alloy frame, filter material is polyamide monofilament fiber, wear-resistant, high strength, long service life.
Generally used in office buildings, conference rooms, hospitals, shopping malls, stadiums, airports and other large civil building ventilation system, general factory centralized ventilation and air conditioning system of return air filtration, clean room centralized ventilation and air conditioning system of primary filtration.

Pleated filter

Pleated filter can choose galvanized frame or cardboard frame according to the need, filter material is synthetic fiber. This type of filter is also known as a disposable filter. The commonly used efficiency is G4.

Pleated filter is usually used in the front end of medium and HEPA filters to intercept large particles of dust, so that the back-end filter has a longer service life.

 Washable filter

The frame of Washable filter is galvanized frame or aluminum frame, the conventional thickness is 10mm,21mm,46mm, etc., and the filter material is synthetic fiber. The commonly used efficiency is G3/G4.
It can be used for pre-filtration of air conditioning and ventilation systems to avoid ash pollution inside the system, for pre-filtration of large air compressors, for return air filtration of clean room centralized ventilation and air-conditioning systems, and for ventilation systems of general industrial plants.

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