G3 G4 Primary Air Filters for Industrial HVAC Systems

BoYang manufactures G3 and G4 primary air filters for industrial ventilation, HVAC systems and air handling units. Also commonly used as pre filters, primary filters capture larger airborne particles such as dust, fibers and debris before the air reaches medium or high-efficiency filtration stages.

Primary filtration helps protect coils, fans, ducts and downstream filters while reducing system contamination and extending the service life of more expensive secondary and HEPA filters.

Our primary air filters are available in different structures, filter media, frame materials and customized dimensions for new HVAC installations and replacement projects.

G3 G4 Pre Filters for First-Stage Air Filtration

Primary air filters are typically installed at the air intake or first filtration stage of an HVAC system.

Depending on the application, G3 and G4 filters can be used to remove coarse particulate matter before air passes through medium efficiency filters or HEPA filters. This staged filtration design reduces dust loading on downstream filters and can help lower maintenance frequency and operating costs.

BoYang supplies panel filters, pleated filters, bag-type pre filters and other customized primary filtration configurations.

Typical Applications of Primary Air Filters

G3-G4 pre filters are widely used in air handling units, commercial HVAC systems, industrial ventilation, factories, warehouses, automotive production, coating facilities and cleanroom pre-filtration systems.

The appropriate filter structure depends on available installation space, airflow, dust loading, required service life and replacement frequency.

Custom Primary Air Filter Manufacturing

We support customized filter dimensions, frame materials, media types and structural designs for different HVAC equipment.

For replacement applications, customers can provide the existing filter dimensions, photographs or drawings. For new projects, our team can recommend an appropriate pre-filter according to airflow, installation conditions and filtration requirements.

Need G3 or G4 pre filters for your HVAC system?

Send us the required size, quantity, airflow or current filter specification for product selection and quotation.