G4

G4 filters are frequently selected as the first filtration stage in multi-stage systems, where they provide reliable protection for downstream filters and internal HVAC components. Their performance characteristics make them suitable for continuous operation in a wide range of ventilation applications.

Because of their proven reliability, G4 filters are often used as a reference point when designing or upgrading HVAC filtration systems.

Typical Applications

G4 air filters are used in ventilation systems where consistent pre-filtration and system protection are required.

Common applications include:

• Commercial building HVAC systems

• Industrial ventilation and air handling units

• Make-up air units serving large facilities

• Manufacturing plants and production areas

• Pre-filtration for F-class and higher-efficiency filters

In these applications, G4 filters help control dust levels and maintain stable operating conditions across the ventilation system.

Performance Highlights

G4 filters are designed to deliver dependable pre-filtration performance under continuous HVAC operation.

Key performance characteristics include:

• High dust-holding capacity for pre-filtration

• Stable pressure drop throughout service life

• Consistent airflow performance

• Effective protection for downstream filtration stages

• Suitable for long-term use in HVAC systems

These characteristics make G4 filters a preferred choice when system reliability and predictable maintenance cycles are important.

FAQ

Why is G4 considered the standard pre-filter grade in HVAC systems?

G4 filters offer a balance between dust capture efficiency and airflow performance that suits most commercial and industrial ventilation systems. This balance makes them widely specified as the first filtration stage.

Can G4 filters be used as the only filter in a ventilation system?

In applications with low air cleanliness requirements, G4 filters may be used as the only filtration stage. In systems requiring cleaner air, they are typically combined with F-class or higher-efficiency filters.

How do G4 filters support downstream filtration stages?

By capturing a significant portion of coarse dust, G4 filters reduce the dust load on finer filters, helping extend their service life and maintain stable system performance.

Are G4 filters suitable for continuous operation?

Yes. G4 filters are designed for continuous HVAC operation and are commonly used in systems that run for extended periods.