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.
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The Airtech G4 panel filter is engineered for AHU primary stage pre-filtration. Synthetic non-woven media in a 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.
Why G4 Pre-Filtration Matters
A correctly specified G4 panel filter protects every filter downstream. Without adequate pre-filtration, coarse dust, building debris, fibres, and insects load 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. Washable up to 6 times for most commercial AHU applications.
Specification: 595x595x48mm
| Filter Class | G4 (EN779:2012) |
| Standard Size | 595 x 595 x 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% or higher (G4 classification) |
| Weight | 1.8 kg |
| Replacement Interval | 3-4 months (Highveld) / 6 months (coastal) |
Resistance vs Airflow: 595x595x48mm
| 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
| Size (WxHxD) | Init. Resistance | Rated Airflow | Weight | Pcs/Carton |
|---|---|---|---|---|
| 595x595x48 | 105Pa +/-10% | 3400 m3/h | 1.8kg | 6 |
| 495x595x48 | 105Pa +/-10% | 2800 m3/h | 1.4kg | 6 |
| 395x595x48 | 105Pa +/-10% | 2250 m3/h | 1.2kg | 6 |
| 295x595x48 | 110Pa +/-10% | 1700 m3/h | 1.0kg | 12 |
| 495x620x48 | 105Pa +/-10% | 2900 m3/h | 1.5kg | 6 |
| 495x495x48 | 110Pa +/-10% | 2300 m3/h | 1.3kg | 6 |
| 395x495x48 | 110Pa +/-10% | 1850 m3/h | 1.1kg | 6 |
| 395x620x48 | 105Pa +/-10% | 2350 m3/h | 1.3kg | 6 |
| 395x395x48 | 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.
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, and fans from coarse airborne particulate that would otherwise accumulate and reduce efficiency.
Office towers, retail centres, and mixed-use developments. G4 pre-filtration is specified as a minimum in most commercial mechanical engineering installations.
The Airtech APP 595x595x48mm 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.
First-stage pre-filtration in hospital AHU systems protecting downstream F9 and HEPA terminal filters from coarse loading.
Control rooms, switch rooms, and office environments within industrial facilities where G4 pre-filtration keeps secondary filters from overloading in high-dust environments.
Pre-filtration for precision cooling units. Protects fine filters and cooling coils from airborne dust, extending service intervals in controlled environments.
First-stage filtration in production facilities where air quality affects product integrity. Removes coarse contaminants before secondary filtration stages.
What is a G4 panel filter used for?
Standard first-stage pre-filter in commercial HVAC AHUs. Protects downstream coils, secondary filters, and fans from coarse airborne particulate.
How often should G4 panel filters be replaced?
Every 3-4 months on the Highveld (Gauteng, dusty conditions). Every 6 months in coastal or cleaner environments. Replace when differential pressure reaches 200-250 Pa.
Can Airtech G4 panel filters be washed and reused?
Yes, washable up to 6 times with the synthetic non-woven media. Rinse with water, dry completely before reinstalling. Performance degrades after multiple washes.
What sizes of panel filter do you stock?
We stock 9 standard sizes from 295x595mm to 595x595mm, all 48mm deep, G4 grade. See the order form above for current pricing and availability.
Do you deliver panel filters nationwide?
Yes, delivery is available nationwide across South Africa. Free delivery on all orders, with same/next-day despatch from our Silverton, Pretoria warehouse.
What certification do your G4 filters have?
Tested and classified to EN779:2012 G4 grade. Average arrestance of 90% or higher. Each production batch is tested; certificates available on request.