Filters are among the most essential components used in Fume Extraction Systems or Fume Extraction Units. FRESHWELD products offer a wide range of filter options for different applications.
When placing product orders, in addition to specifying the intended application area, our Project Managers and Sales Representatives assist in selecting the most suitable filter for your process.
FRESHWELD Fume Extraction and Filtration Systems are generally configured with 3 main filters and additional auxiliary filters depending on the process requirements.
What Are the Filters Used in Fume Extraction Systems?
- The first filter – Spark Arrestor: This perforated metal plate prevents sparks generated during welding or grinding from reaching the main filters.
- The second – Pre-Fiber Filter: Captures coarse dust and particles entering through the extraction system. It filters debris and splatter produced during welding or grinding operations.
- The third – Main Cassette Filter: Traps particles smaller than 10 microns that pass through the fiber filter. With its high-efficiency surface area, it provides long-lasting performance.
- The fourth – Optional Filters: Recommended based on the base material used during welding or grinding and the composition of fumes, odors, and vapors generated during the process.
Filter Placement in Fume Extraction Systems
How to Choose the Right Filter for Fume Extraction Systems?
Each welding process produces a distinct fume composition and particle density. Therefore, the type of welding wire, electrode, filler material, shielding gas, and chemical content are critical factors in determining suction capacity and filtration technology.
Using the same suction power or same filter type for every welding process can reduce process efficiency and negatively affect filtration performance.
At FRESHWELD, we recommend evaluating customized filtration solutions tailored to your welding processes. To get detailed information on the most suitable filter materials, filter classes, and media types, contact our sales team for process-specific recommendations.
*The filter selection table has been exclusively designed for FRESHWELD Fume Extraction Units.
Pre-Filters
| Particle Size | EN 779 | Average Efficiency | ISO 16890 |
|---|---|---|---|
| > 10 µm | G2 | 65 ≤ Am < 80 | Coarse 40% |
| 3 ~ 10 µm | G3 | 80 ≤ Am < 90 | Coarse 50% |
| G4 | 90 ≤ Am | Coarse 70% |
Fine Filters
| Particle Size | EN 779 | Average Efficiency | ISO 16890 | ||
|---|---|---|---|---|---|
| ePM1 | ePM2.5 | ePM10 | |||
| 1 ~ 3 µm | M5 | 40 ≤ Em < 60 | 5% ~ 35% | 10% ~ 45% | 40% ~ 70% |
| M6 | 60 ≤ Em < 80 | 10% ~ 40% | 20% ~ 50% | 60% ~ 80% | |
| 0.3 ~ 1 µm | F7 | 80 ≤ Em < 90 | 40% ~ 65% | 65% ~ 75% | 80% ~ 90% |
| F8 | 90 ≤ Em < 95 | 65% ~ 90% | 75% ~ 95% | 90% → 95% | |
| F9 | 95 ≤ Em | 80% ~ 90% | 85% ~ 95% | 90% → 95% | |
EPA Filters
| Particle Size | Average Efficiency | EN 1822 | Average Efficiency |
|---|---|---|---|
| Ẽ % @ 0.3 µm | Ẽ % @ MPPS | ||
| 0.3 ~ 1 µm | ≤ 95 | E10 | ≤ 85 |
| < 0.3 µm | ≤ 98 | E11 | ≤ 95 |
| ≤ 99.99 | E12 | ≤ 99.5 |
HEPA Filters
| Particle Size | Average Efficiency | EN 1822 | Average Efficiency |
|---|---|---|---|
| < 0.3 µm | Ẽ % @ 0.3 µm | Ẽ % @ MPPS | |
| ≤ 99.997 | H13 | ≤ 99.95 | |
| ≤ 99.999 | H14 | ≤ 99.995 |
ULPA Filters
| Particle Size | Average Efficiency | EN 1822 | Average Efficiency |
|---|---|---|---|
| 0.2 ~ 0.1 µm | Ẽ % @ 0.12 µm | ||
| ≤ 99.9995 | U15 | ≤ 99.9995 | |
| ≤ 99.99995 | U16 | ≤ 99.99995 | |
| ≤ 99.999995 | U17 | ≤ 99.999995 |
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