The Three Tiers at a Glance
| Primary (G1-G4) | Medium (F5-F9) | HEPA/ULPA (H10-H14+) | |
|---|---|---|---|
| Removes | Coarse dust, hair, fibres | Fine dust, pollen, microbes | Sub-micron, bacteria, most viruses |
| Initial ΔP | 20-45 Pa | 45-95 Pa | 100-300 Pa |
| Life | 3-6 months | 6-12 months | 1-3 years |
| Cost | Low | Medium | High |
| Typical role | Pre-filter | Final or pre-HEPA | Final in clean/critical spaces |
How They Work Together
A sound design stacks them: G4 pre – F7/F9 medium – H13/H14 HEPA. The pre-filter shields the costly stages; the medium lifts IAQ; the HEPA guarantees cleanliness where it counts.
Picking Your Combination
- Comfort HVAC: G4 + F7.
- Health-care: G4 + F8 + H13 terminal.
- Cleanroom: G4 + F9 + H14 (add U15 for ISO 3-4).
Browse our primary, medium and HEPA product guides for model-level specs.
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Product Line-up & Side-by-Side Specifications
| Parameter | Primary G4 | Medium F7 | High-efficiency H13 |
|---|---|---|---|
| Standard | EN 779 / ISO 16890 Coarse | EN 779 / ISO 16890 ePM1 | EN 1822 |
| Efficiency | 90–95% arrestance | 80–90% (ePM1 50–65%) | ≥ 99.95% @ MPPS |
| Position in the filtration train | 1st stage — protects downstream filters | 2nd stage — supply-air quality | Terminal — cleanrooms, labs, operating theatres |
| Typical initial ΔP | 45–70 Pa | 95–130 Pa | 200–250 Pa |
| Recommended final ΔP | 150 Pa | 250–300 Pa | 450–600 Pa |
| Typical replacement interval | 3–6 months | 6–12 months | 1–3 years (ΔP based) |
| Typical applications | Outdoor-air and return-air pre-filtration in AHUs | Offices, malls, food & pharma HVAC | Hospitals, cleanrooms, coating booths, electronics |
Rule of thumb: stage primary → medium → high efficiency in series, and let each stage reach its recommended final ΔP before replacement — this is what protects the more expensive stage behind it.
