1. What is a G4 filter?

A G4 filter is a type of filter used to improve indoor air quality in working environments. According to the EN779 standard, the G4 filter is classified as a coarse filter, and is also known as the G4 pre-filter or the G4 primary filter.

*Coarse filters are classified according to the average filtration efficiency of synthetic dust, ranging from G1 (50-65% filtration efficiency) to G4 (90% filtration efficiency).

The G4 filter is designed to filter out pollen, mist, and coarse dust particles (≥10μm). It also captures leaves, insects, textiles, sand, ash, fog, and hair. Note that 10µm is equivalent to 0.01mm.

G4 filters are sold in two forms: rolls (G4 filter cotton) and finished products in sheet form (G4 air filter).

  • Raw form: A roll form made from synthetic fiber material. It is white cotton, with a weight of 350~380g/m2 and a weight of about 15kg or more.

  • Finished product: Available in the form of a plate, also known as a G4 air filter, manufactured based on the size and frame material according to customer requirements.

2. Features of filter class G4

+ G4 filter efficiency according to EN779 standard: 90%~95%

+ Filter material: Made of synthetic fiber, non-woven fabric, activated carbon filter material

+ Frame material: Metal frame (aluminum frame, galvanized iron frame) / anti-corrosion plastic frame,...

+ Mesh: metal hole mesh, with double-sided sprayed wire mesh and two-sided galvanized steel mesh.

+ Thickness of filter cotton G4: 20mm

Advantages of G4 air filter

- Low cost

- Long life

- Lightweight, easy to transport

- Good applicability

- Compact structure

- Easy to install and use

G4 filter specification

- Standard EN779 is the European standard for the classification of filters based on dust filtration efficiency.

The EN779 standard specifies a G4 filter with an efficiency of >90% in filtering synthetic dust particles.

- The initial pressure drop is 45Pa, and the recommended final pressure drop is 250Pa

3. Applications of G4 filter

The G4 filter is widely used in many industries, including:

Daily life application

G4 filters make the air at home and in the workplace cleaner and fresher.

Air pollution becoming more and more serious. Particularly, the AQI index - which reports the air quality in big cities is always at a high level (150~300), and the use of dust filters helps to protect the health of the people. health for you and your family members.

G4 filter (G4 filter) can be integrated into residential air purifiers.

In addition, the kitchen odors, and cigarette smells,... will be significantly reduced when using the G4 filter in the house.

Industrial application

G4 filters are used to filter dust in the paint room. Paint dust particles causing harm to workers' health are trapped and cannot spread out.

A common application of the G4 filter is in cleanrooms. A cleanroom is an area that is strictly controlled for cleanliness, air quality, humidity, and differential pressure.

G4 filter is commonly used in clean rooms for primary filtration of air conditioning and ventilation systems, cleaning return air systems, and central air conditioning and central ventilation systems.

Normally, there are 3 levels of filtration in an air handling system: primary filtration, intermediate filtration - fine filtration, and advanced filtration (HEPA high-efficiency filtration).

The job of the G4 filter is to filter out coarse particles and protect the middle filters and high-efficiency HEPA filters.

4. Choosing the right G4 filter

There are several important factors to consider choosing the right G4 filter.

Size and thickness

It's essential to select a filter that is the correct size and thickness for your HVAC system. This will ensure that the filter fits properly and can effectively capture particles.

Quality

Quality is also a critical consideration, as not all G4 filters are created equal. Look for filters made from high-quality materials and manufactured by reputable brands.

Proper installation and maintenance

Proper installation and maintenance are essential for optimal performance.

Be sure to follow the manufacturer's instructions for installation and replacement, and make sure to replace your G4 filter regularly to keep your indoor air clean and healthy.

By keeping these factors in mind, you can choose a G4 filter that meets your needs and helps to improve your indoor air quality.

5. Where to buy G4 filter?

Currently, G4 filters are manufactured by factories in Vietnam, China, Japan, and the US,... with different qualities and prices. Depending on their needs and standards, customers have a variety of options to buy.

If you are still wondering how to find a reputable G4 dust filter supplier, Vietnam Cleanroom is a place worth referring to. We are proud to be the filter supplier of filter factories with more than ten years of experience, meeting EN779:2012 standards, and having European export certificates.

Please contact the hotline: +84 90 123 9008 right away for a consultation team to help you choose the right G4 filter!

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