G4 Filter Class: Characteristics and When to Choose It
Filters are categorized based on their efficiency, and the G4 filter belongs to the "coarse filtration" category. These filters are designed to capture larger particles, typically ranging from 10 to 50 microns in size, helping to protect ventilation systems from dust, debris, and other contaminants.
Why Choose a G4 Filter?
G4 filters are commonly used because they offer:
- Lower airflow resistance compared to higher efficiency filters like M5 or F7, meaning less energy is needed to run your ventilation system.
- Longer lifespan, as they are less likely to clog quickly.
What Does a G4 Filter Capture?
G4 filters are effective at trapping medium-sized dust particles, sand, insects, lint, and even some larger pollen particles. They provide sufficient filtration to keep ventilation systems running smoothly and cleanly.
Common Uses for G4 Filters
Due to their low resistance and efficiency, G4 filters are often used in:
Exhaust air filtration: Standard in many air handling units (e.g., Brink, Vallox, Zehnder) to protect heat exchangers from clogging.
Dust protection in air ducts: Installed in extract air valves to prevent dust build-up in ducts.
Pre-filters in ventilation systems: They catch the majority of contaminants, extending the life of higher-grade supply air filters like F7-F9. These can be installed in separate filter boxes or directly in the unit.
Main supply air filters: In low-pollution areas, where the air quality is good and occupants are not sensitive to pollen, a G4 filter can be an excellent long-lasting choice without increasing energy use.
When to Choose a G4+G4 Filter Set
Consider the G4+G4 filter set for your air handling unit if:
- No one in your household suffers from hay fever.
- There are no asthma sufferers or people with chronic respiratory conditions in the home.
- Your home is away from busy roads or streets.
- You live in a suburban area with little pollution and where neighbors don’t use solid fuels for heating.
- There is no smog in your area.
G4 Filter in ISO 16890 standard
According to the ISO 16890 standard, a G4 filter corresponds to a "Coarse 60%-90%" efficiency rating.
Explore our full range of G4 filters for Mechanical Ventilation with Heat Recovery (MVHR) systems at cleanfilter.co.uk.