Filtration Role & Standard
This product is positioned as a G4 pre-filter in a multi-stage air handling system:
Filter class: EN 779 G4 (coarse filter)
Typical performance: around 80–90% removal for particles ≥5–10 μm
Function in the system: first-stage protection in front of F-class, bag, box or HEPA filters
In most comfort HVAC and light industrial systems, a coarse G4 panel filter at the fresh air or return air section is sufficient to manage larger particulate, as long as a finer stage is installed downstream. It stabilises the dust load on more expensive filters, supports better indoor air quality, and reduces overall filtration cost.
For buyers referencing other standards, G4 is commonly used as the coarse level roughly comparable to lower MERV classes in primary air filtration.
Construction & Materials
This G4 primary panel filter is built for routine operation in air handling equipment:
Frame
Rigid aluminium or galvanised steel frame (depending on model)
Resistant to distortion during handling and operation
Compatible with standard holding frames and slide-in filter tracks
Filter Media
Synthetic polyester fibre with progressive density
Coarser fibre layer on the upstream side, finer structure deeper in the media
Optimised specifically for G4 coarse filtration and stable loading behaviour
Pleat Pack & Support
Even pleat spacing to maximise effective surface area
Internal support and optional metal backing mesh to prevent pleat collapse under airflow
Media positively bonded to the frame to minimise bypass leakage
This construction gives the filter a good balance of robustness, airflow performance and cost, making it suitable for bulk supply to facilities and OEMs.
Typical Technical Data
Values below are indicative; final data can be tuned to your specific size and operating conditions:
Filter Class: EN 779 G4 (coarse filter)
Media Type: Synthetic polyester fibre
Frame: Aluminium or galvanised steel panel frame
Efficiency Range: approx. 80–90% for particles ≥5–10 μm (typical coarse grade)
Initial Pressure Drop: up to 100 Pa at 4.7 m/s (significantly lower at common HVAC velocities)
Recommended Face Velocity: generally 1.5–2.5 m/s for AHU applications
Typical Final Pressure Drop: 200–250 Pa (system-dependent)
Operating Temperature: approx. −10°C to +40°C in normal HVAC environments
Available Sizes: standard and custom dimensions for new builds and retrofits
For tender packages or design calculations, detailed performance sheets can be provided on request.
Our Certifications
Our g4 pleated panel filter international quality standards, and all products undergo strict simulated condition testing and trial operation before leaving the factory. We are proud to present our ISO certifications and other industry recognitions as proof of our commitment to excellence.ve our commitment to excellence.
Choosing G4 in a Multi-Stage System
When selecting a primary filter, it is useful to position this G4 panel filter against other grades:
Use G4 when:
The objective is to intercept coarse dust and fibres before finer filters
There is a downstream F-class, bag, box or HEPA filter handling smaller particles
Low initial pressure drop and energy efficiency are important
The system serves comfort or general process areas rather than ultra-critical spaces
Move to higher grades (e.g. F7 and above) when:
No secondary filter stage is planned
The air directly serves cleanrooms or zones with strict particulate limits
Project or regulatory requirements specify a minimum fine filter class
In many projects, a G4 primary stage followed by a suitable fine or HEPA stage gives a balanced combination of protection, lifetime and running cost.
Company Introduction and Workshop Photos
We've been in the game since 1997, and over the years, we've become a trusted name in air filter manufacturing-one that customers keep coming back to. Our workshop is kitted out with cutting-edge machinery, and behind it all is a team of technicians who truly master their craft. They've spent years refining their skills, so every tiny detail gets the care it deserves, right down to the last stitch.
In order to deliver filters to customers around the world, we have established a solid overseas trade network. But it's not just about shipping products across borders. It's important to us to ensure that every filter that leaves our factory is intact, whether it's sold to a local business or to far-flung places around the world. From small orders to large-volume shipments, we always take pride in maintaining consistent quality.
Everything You Need to Know
What is the main function of a G4 coarse panel filter?
It acts as the first barrier in HVAC or AHU systems, capturing larger particles to protect coils and downstream fine or HEPA stages and to keep the system cleaner overall.
Can it be used as the only filter in the system?
In some non-critical comfort or exhaust applications, a single coarse grade may be acceptable. For better indoor air quality or sensitive processes, it is usually combined with finer stages.
How often should these filters be replaced?
There is no fixed interval, as it depends on dust load and operating hours. Many sites monitor pressure drop and replace the filter when it reaches the defined final resistance rather than on time alone.
Can you match our existing primary filter sizes?
Yes. We can manufacture custom-size G4 pre-filters according to your current dimensions or drawings, including non-standard depths.
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