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Understanding G4 Air Filters and Their Place in the Filtration Spectrum

When it comes to indoor air quality, the right air filter can mean the difference between a clean, healthy environment and poor living conditions. G4 air filters and filter media are key players in this field, balancing affordability with performance.

What Are G4 Air Filters?

G4 air filters are medium-efficiency air filters widely used in various ventilation and air conditioning systems.

They are crafted from synthetic media or fiberglass and are designed to trap particles between 5 and 10 microns in size, including pollen, dust mites, and spray paint dust. Their unique structure allows for high dust-holding capacity while maintaining lower pressure drops.

The Filtration Spectrum and EN 779 Standard

Air filters are categorized based on their efficiency at trapping particles of various sizes.

EN 779 Standard

The European Standard EN 779 provides the framework for classifying and testing these filters based on their ability to capture and hold dust. Under this standard, G4 air filters must demonstrate a certain minimum level of efficiency.

This classification ensures that G4 filters are reliable for capturing most of the particulate matter commonly found in commercial and residential buildings, providing a clear benchmark for consumers and professionals in the air quality industry.

The filtration spectrum ranges from G1, the least efficient, to U17, the most efficient in ultra-fine filtration. G4 filters sit comfortably in the middle, classified under the European Standard EN 779, which dictates their performance must meet specific minimum standards for medium-efficiency filtration.

Comparison of different filtration ratings.

Comparing G4 Air Filters with Other Grades

Compared to lower-grade filters like G1-G3, G4 filters capture more and smaller particles. They are less efficient than higher grades like G5-G9, which are closer to HEPA standards in terms of particle size filtration.

G4 filters are the middle ground, offering a cost-effective solution for environments where air quality needs are significant but not extreme.

The Role and Applications of G4 Air Filters

G4 Filters are a main role-player in air filtration

G4 filters are typically employed as pre-filters in HVAC systems, capturing larger particles and protecting more refined filters downstream. This not only improves the air quality but also prolongs the life of subsequent high-efficiency filters.

Applications of G4 Filters

G4 air filters are ideal for commercial buildings, industrial spaces, and anywhere air quality is a moderate concern but not at the level requiring HEPA filtration.

Food Processing


Food Processing





CleanLink Offers Premium G4 Filters

G4 filters are a cost-effective choice for system operators. While higher-grade filters offer superior particle capture, they also come with a higher price tag and can lead to increased energy consumption due to their denser filtering media.


On the other hand, G4 filters offer a balance, offering sufficient filtration for many applications at a lower operational cost. They are an ideal choice in applications where the air quality does not demand the highest levels of particle control, such as in spaces without specialized equipment or sensitive occupants.

By choosing G4 air filters, building managers can maintain good indoor air quality without incurring the higher costs associated with more advanced filtration options.


G4 air filters play a crucial role in the filtration spectrum, providing reliable filtration for a range of applications. Their classification under the EN 779 standard ensures that they meet established air quality benchmarks, making them a trustworthy choice for many environments. When selecting air filters, it’s essential to consider the specific requirements of your space to ensure you choose the right grade.


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