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Dust Collection

HEPA Filtration
System

High-efficiency particulate air filtration removing ≥ 99.97% of particles ≥ 0.3 microns — final-stage protection for people, processes and clean air discharge.

99.97% @ 0.3µm Cleanroom Ready Hazardous Dust Duty
Request a Quote 1300 131 944
Industrial HEPA filter chamber interior — pleated filter panels in final filtration unit

What is it

HEPA Filtration System

HEPA (High-Efficiency Particulate Air) filter is a high-performance air filter designed to remove very fine particles from air. They are designed to remove ≥ 99.97% of particles ≥ 0.3 microns including Dust, Pollen, Smoke and Bacteria.

HEPA filters don't work like simple sieves, instead they use three mechanisms:

  1. Impaction: Large particles crash into fibers and stick
  2. Interception: Medium particles follow airflow but touch fibers and get trapped
  3. Diffusion: Very tiny particles move randomly (Brownian motion) and collide with fibers

This combination is why HEPA filters are so effective—even for very small particles.

Common Applications

HEPA filters are used to remove hazardous particles, toxic dust, and in areas where contamination must be minimized. They are commonly used in:

  • Final Filtration after dust collectors
  • High-end Ventilation Systems
  • Industrial applications handling hazardous dust
  • Hospitals & Health Care Centers
  • Clean rooms
  • Bio Safety Cabinets & Research Labs
  • Air Purifiers
HEPA filtration process — impaction, interception and diffusion through dense fibrous filter media
HEPA filtration process
99.97% Filtration Efficiency
0.3µm Particle Capture Size
H14 Highest HEPA Grade
6+ Industries Served

Technical illustrations

How HEPA Filtration Works

Reference diagram from GPC client documentation.

HEPA filtration process — impaction, interception and diffusion through dense fibrous filter media with contaminated air in and clean air out
HEPA filtration process — impaction, interception and diffusion

Model selection

HEPA Filtration System Selection Guide

GPC HEPA models — airflow capacity, filter size, power supply and typical applications from GPC-HF-500 through GPC-HF-30000.

GPC HEPA Filtration Systems — models and capacities with H13/H14 filter class and standard features

Capacities are approximate and vary by filter configuration, ducting and application. Contact us for precise sizing — 1300 131 944 or request a quote.

Operating Principle

How HEPA After-Filters Work

HEPA filtration uses three physical capture mechanisms acting simultaneously on sub-micron particles — impaction, interception and diffusion — achieving extraordinary efficiency without moving parts.

01
Pre-filtered air enters the after-filter housing
Air that has already passed through a primary dust collector enters the HEPA after-filter housing. A pre-filter stage (G4 or F7 class) removes coarser particles first, extending HEPA media life.
02
Air passes through pleated HEPA media
The airstream flows through densely pleated borosilicate glass fibre or synthetic HEPA media. The pleating maximises surface area, reducing pressure drop while maintaining high velocity capture.
03
Impaction captures large sub-micron particles
Larger sub-micron particles (above ~1 micron) travelling with sufficient inertia cannot follow airstream curves around fibres and impact directly into the filter media where they are trapped.
04
Interception catches mid-range particles
Particles in the 0.1–1 micron range that follow airstream paths come close enough to fibre surfaces to physically contact and adhere to them through Van der Waals forces.
05
Diffusion traps ultra-fine particles
The smallest particles (below 0.1 micron) move erratically due to Brownian motion, causing them to contact and adhere to fibres. This is why HEPA efficiency actually increases for the very smallest particles.
06
Clean air discharged or recirculated
Ultra-clean air exits the HEPA unit at ≥99.97% efficiency. Differential pressure monitoring indicates filter loading — when threshold is reached, the filter element is replaced and safely disposed of.

Applications

Industries Served

HEPA after-filters are essential wherever fine respirable dust, toxic powders, or contamination-sensitive processes demand the highest air quality standards.

Pharmaceutical
Capturing API, excipient and tablet dusts in GMP manufacturing environments.
Food Processing
Final-stage filtration for flour, sugar and spice dust to meet food-safe air standards.
Electronics & Cleanrooms
ISO cleanroom-grade air filtration protecting sensitive electronics from particle contamination.
Healthcare & Laboratories
Protecting staff and specimens from airborne pathogens, allergens and fine particulates.
Nuclear & Defence
Containing radioactive and hazardous particles in high-consequence controlled environments.
Chemical Manufacturing
Final barrier capture for fine toxic or reactive chemical powders before air discharge.
General Industry
After-filter stage for any application requiring air quality beyond primary collector capability.
System Components
We supply, service and install complete HEPA after-filter systems including:
  • HEPA media packs (H13 / H14 grade)
  • Pre-filter stage (G4 / F7 / F9 class)
  • Housing & filter casing
  • Gasket & gel-seal frame system
  • Differential pressure gauge & alarm
  • Support grid & airflow distribution
  • Bag-in / bag-out safe change systems
Key Benefits
Why HEPA after-filters are essential for high-demand applications:
  • 99.97% efficiency at the most penetrating particle size (0.3µm)
  • Protects downstream equipment from fine particle damage
  • Enables safe air recirculation — reducing heating/cooling costs
  • Meets AS1668, GMP, ISO cleanroom & WHS standards
  • No moving parts — silent, low-maintenance operation
  • Compact footprint — easily retrofitted to existing systems
  • Safe-change bag-in/bag-out options for hazardous applications

Maintenance & Support

HEPA after-filter maintenance ensures continued performance, compliance and safe handling of loaded filter media.

Differential pressure monitoring
Pre-filter replacement service
HEPA element safe-change service
Housing integrity inspection
Leak & bypass scan testing
Emergency breakdown support
Why Galaxy Services?

We don't just supply filters.
We engineer compliant air quality systems.

From filter selection and airflow calculation to housing design, installation, commissioning and ongoing maintenance — Galaxy Pollution Control delivers complete HEPA after-filter solutions that meet your compliance requirements and protect your process. Talk to our air quality engineers today.

Book a System Assessment
Filter sizing, compliance review and site audit.
Contact Us
1300 131 944 Sales@galaxyservices.net.au