G4 Panel Filters — EN779 Certified Pre-Filters for AHU and HVAC
The Airtech G4 panel filter is engineered for AHU primary stage pre-filtration. Synthetic or glass fibre media, rigid aluminium alloy frame, available in all standard AHU frame sizes. EN779-certified to G4 grade — efficiency verified, not estimated. Standard sizes are held in stock at our Silverton warehouse; non-standard dimensions are available on lead time. Call with your AHU frame size and we will confirm availability.
Technical Data — 595×595×48mm
| Filter Class | G4 (EN779:2012) |
| Standard Size | 595 × 595 × 48 mm |
| Media Type | Non-woven synthetic (washable) |
| Frame | Aluminium alloy |
| Initial Resistance | 105 Pa ±10% at 3 400 m³/h |
| Final Resistance | 200–250 Pa (replace at this reading) |
| Avg. Arrestance | ≥ 90% (G4 classification) |
| Weight | 1.8 kg |
| Replacement Interval | 3–4 months (Highveld) / 6 months (coastal) |
Resistance vs Airflow — 595×595×48mm
| Airflow (m³/h) | 1500 | 2000 | 2500 | 3000 | 3400 | 4000 | 4500 | 5000 |
|---|---|---|---|---|---|---|---|---|
| Resistance (Pa) | 30 | 40 | 58 | 78 | 95 | 120 | 140 | 165 |
Available Sizes — All G4, 48mm Deep
| Model | Size (W×H×D) | Init. Resistance | Rated Airflow | Weight | Pcs/Carton |
|---|---|---|---|---|---|
| APP595×595×48-G4 | 595×595×48 | 105Pa ±10% | 3400 m³/h | 1.8kg | 6 |
| APP495×595×48-G4 | 495×595×48 | 105Pa ±10% | 2800 m³/h | 1.4kg | 6 |
| APP395×595×48-G4 | 395×595×48 | 105Pa ±10% | 2250 m³/h | 1.2kg | 6 |
| APP295×595×48-G4 | 295×595×48 | 110Pa ±10% | 1700 m³/h | 1.0kg | 12 |
| APP495×620×48-G4 | 495×620×48 | 105Pa ±10% | 2900 m³/h | 1.5kg | 6 |
| APP495×495×48-G4 | 495×495×48 | 110Pa ±10% | 2300 m³/h | 1.3kg | 6 |
| APP395×495×48-G4 | 395×495×48 | 110Pa ±10% | 1850 m³/h | 1.1kg | 6 |
| APP395×620×48-G4 | 395×620×48 | 105Pa ±10% | 2350 m³/h | 1.3kg | 6 |
| APP395×395×48-G4 | 395×395×48 | 110Pa ±10% | 1500 m³/h | 0.9kg | 6 |
All: Aluminium alloy frame, washable non-woven synthetic media, G4 EN779:2012. Final resistance: 200–250 Pa.
Applications
G4 panel filters are the standard first-stage pre-filter in commercial HVAC air handling units across South Africa. Their function is to protect the downstream system — coils, secondary filters, fans — from coarse airborne particulate that would otherwise accumulate and reduce efficiency.
- Commercial buildings — Office towers, retail centres, and mixed-use developments — G4 pre-filtration is specified as a minimum in most commercial mechanical engineering installations.
- HVAC maintenance contractors — The Airtech APP 595×595×48mm is the most common AHU pre-filter size in South African commercial installations. Held in local stock for same/next-day supply to maintenance contractors.
- Hospitals and healthcare — First-stage pre-filtration in hospital AHU systems protecting downstream F9 and HEPA terminal filters from coarse loading.
- Industrial plant offices — Control rooms, switch rooms, and office environments within industrial facilities — where G4 pre-filtration keeps secondary filters from overloading in high-dust environments.
Why G4 Pre-Filtration Matters for Your AHU
A correctly specified G4 panel filter protects every filter downstream. Without adequate pre-filtration, coarse dust — building debris, fibres, insects — loads your secondary F9 pocket filters within weeks instead of months. Replace the G4 regularly and your F9 bags last their full service life. Neglect the G4 and you are replacing expensive secondary filtration at two to three times the normal frequency.
The Airtech G4 panel filter is sized and specified to protect your investment downstream. For most commercial AHU applications, washable up to 6 times.
Ready to order?
Local stock. Same/next-day despatch. Call Nick: +27 74 159 1634