WFIFS stainless steel compressed air microfilters up to 14 bar
The WFIFS microfilter is the finest mechanical stage of the WFIF range. The pleated borosilicate microfibre element traps particles larger than 0.01 µm and removes oil down to a residual content below 0.01 mg/m³ — class 1-x-1 according to ISO 8573-1.
The WFIFS filter comes in 16 sizes (DN15 to DN200) with flows of 2,500 to 352,000 l/min at 7 bar; working pressure up to 14 bar, sizes from DN100 up to 10 bar. It is one of the stages of the WFIF filters — the housing is the same for all stages, only the element differs.
WFIFS filters by size
The size determines the connection and the flow. Each size has its own PF range spare element.
| WFIFS filters and spare elements by size | ||||||
|---|---|---|---|---|---|---|
| Filter | Connection | l/min at 7 bar | Nm³/h at 7 bar | Height A × diameter C | Weight | Spare element |
| WFIFS-010 | DN15 flange | 2,500 | 150 | 230 × 76.1 mm | 3.5 kg | PFS-010V |
| WFIFS-018 | DN20 flange | 3,750 | 225 | 263 × 76.1 mm | 4.3 kg | PFS-018V |
| WFIFS-030 | DN25 flange | 5,250 | 315 | 279 × 88.9 mm | 5.7 kg | PFS-030V |
| WFIFS-047 | DN32 flange | 7,000 | 420 | 348 × 88.9 mm | 6.6 kg | PFS-047V |
| WFIFS-070 | DN40 flange | 10,000 | 600 | 391 × 114.3 mm | 8 kg | PFS-070V |
| WFIFS-094 | DN50 flange | 15,000 | 900 | 444 × 114.3 mm | 9.8 kg | PFS-094V |
| WFIFS-150 | DN50 flange | 21,000 | 1,260 | 571 × 114.3 mm | 11 kg | PFS-150V |
| WFIFS-175 | DN65 flange | 28,000 | 1,680 | 752 × 139.7 mm | 14.2 kg | PFS-175V |
| WFIFS-200 | DN80 flange | 40,000 | 2,400 | 978 × 139.7 mm | 21.2 kg | PFS-200V |
| WFIFS-240 | DN80 flange | 60,000 | 3,600 | 1,041 × 168.3 mm | 22.9 kg | PFS-240V |
| WFIFS-450 | DN100 flange | 84,000 | 5,040 | 981 × 219.1 mm | 55 kg | 3× PFS-175V |
| WFIFS-600 | DN100 flange | 112,000 | 6,720 | 1,288 × 219.1 mm | 64 kg | 3× PFS-200V |
| WFIFS-900 | DN150 flange | 160,000 | 9,600 | 1,310 × 273 mm | 87 kg | 4× PFS-200V |
| WFIFS-1200 | DN150 flange | 224,000 | 13,440 | 1,351 × 323.9 mm | 110 kg | 6× PFS-200V |
| WFIFS-1800 | DN200 flange | 288,000 | 17,280 | 1,496 × 406.4 mm | 200 kg | 8× PFS-200V |
| WFIFS-2000 | DN200 flange | 352,000 | 21,120 | 1,496 × 406.4 mm | 200 kg | 10× PFS-200V |
The flows apply to a pressure of 7 bar and a temperature of +20 °C. Dimensions according to the manufacturer’s technical data sheet; you will find further data on the product page of each filter.
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When to use it
The microfilter S is suitable wherever the air must be very clean of particles and oil. It is also a mandatory stage before activated carbon — only with it does activated carbon reach solid particle class 1.
A fine pre-filter M goes before the microfilter S; it traps particles and oil down to 0.1 µm, and the microfilter element then lasts longer. The element withstands +120 °C.
Where to place it
After the WFIFM fine pre-filter, which protects it. It can be followed by the WFIFA activated carbon.
Flow by pressure
The catalogue flows apply to a pressure of 7 bar and a temperature of +20 °C. At a different pressure, they are multiplied by the correction factor: 1.88 at 14 bar.
| WFIFS filter flow in l/min by pressure | ||||
|---|---|---|---|---|
| Size (connection) | 4 bar | 7 bar | 10 bar | 14 bar |
| 010 (DN15 flange) | 1,575 | 2,500 | 3,450 | 4,700 |
| 018 (DN20 flange) | 2,363 | 3,750 | 5,175 | 7,050 |
| 030 (DN25 flange) | 3,308 | 5,250 | 7,245 | 9,870 |
| 047 (DN32 flange) | 4,410 | 7,000 | 9,660 | 13,160 |
| 070 (DN40 flange) | 6,300 | 10,000 | 13,800 | 18,800 |
| 094 (DN50 flange) | 9,450 | 15,000 | 20,700 | 28,200 |
| 150 (DN50 flange) | 13,230 | 21,000 | 28,980 | 39,480 |
| 175 (DN65 flange) | 17,640 | 28,000 | 38,640 | 52,640 |
| 200 (DN80 flange) | 25,200 | 40,000 | 55,200 | 75,200 |
| 240 (DN80 flange) | 37,800 | 60,000 | 82,800 | 112,800 |
| 450 (DN100 flange) | 52,920 | 84,000 | 115,920 | – |
| 600 (DN100 flange) | 70,560 | 112,000 | 154,560 | – |
| 900 (DN150 flange) | 100,800 | 160,000 | 220,800 | – |
| 1200 (DN150 flange) | 141,120 | 224,000 | 309,120 | – |
| 1800 (DN200 flange) | 181,440 | 288,000 | 397,440 | – |
| 2000 (DN200 flange) | 221,760 | 352,000 | 485,760 | – |
Element, condensate drainage and maintenance
A PF range element is fitted in the housing — for example, the PFS-010V for the WFIFS-010. The same element also fits the PFS-010, HPFS-010, WFITS-010, WFIWS-010 and WHFITS-010. Flanged filters from DN100 have several elements — their number is given in the table for each size. Element working temperature +1.5 to +120 °C.
The filter is supplied with an element, without a condensate drain. For WFIF filters, the manufacturer offers the AOK20SS stainless steel float drain up to 20 bar and +65 °C and, for the head, the MDHI 50-K differential pressure gauge. The drain outlet in the bottom has a G 1/2" thread, G 1" for sizes from DN100.
Replace the element at least once every 12 months. Once a year, also check the housing for visible damage.
Accessories for WFIFS filters
MDHI 50-K gauge
Differential pressure gauge with connecting tubes; it shows how clogged the element is.
The same stage in other ranges
Stage S also comes in the PFS filters up to 14 bar, HPFS filters up to 50 bar, WFITS filters up to 14 bar, WFIWS filters up to 14 bar and WHFITS filters up to 50 bar. The elements are the same for all ranges.
Ventilek’s tip
A microfilter needs a fine pre-filter. Install the fine pre-filter M before the microfilter S. The microfilter then only deals with the finest particles, and its element lasts longer.
- What purity does the WFIFS microfilter achieve?
- Particles down to 0.01 µm and residual oil below 0.01 mg/m³, class 1-x-1 according to ISO 8573-1.
- What goes before the microfilter?
- A fine pre-filter M, so that the microfilter element does not clog as quickly.
- When should the element be replaced?
- At least once every 12 months.
Product sorting
List of products
With a DN15 connection and a flow of 2,500 l/min at 7 bar, the WFIFS-010 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN20 connection and a flow of 3,750 l/min at 7 bar, the WFIFS-018 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN25 connection and a flow of 5,250 l/min at 7 bar, the WFIFS-030 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN32 connection and a flow of 7,000 l/min at 7 bar, the WFIFS-047 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN40 connection and a flow of 10,000 l/min at 7 bar, the WFIFS-070 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN50 connection and a flow of 15,000 l/min at 7 bar, the WFIFS-094 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN150 connection and a flow of 224,000 l/min at 7 bar, the WFIFS-1200 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN50 connection and a flow of 21,000 l/min at 7 bar, the WFIFS-150 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN65 connection and a flow of 28,000 l/min at 7 bar, the WFIFS-175 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN200 connection and a flow of 288,000 l/min at 7 bar, the WFIFS-1800 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN80 connection and a flow of 40,000 l/min at 7 bar, the WFIFS-200 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN200 connection and a flow of 352,000 l/min at 7 bar, the WFIFS-2000 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN80 connection and a flow of 60,000 l/min at 7 bar, the WFIFS-240 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN100 connection and a flow of 84,000 l/min at 7 bar, the WFIFS-450 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN100 connection and a flow of 112,000 l/min at 7 bar, the WFIFS-600 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a DN150 connection and a flow of 160,000 l/min at 7 bar, the WFIFS-900 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....