AAFS compressed air microfilters, class 1-x-1
The AAFS microfilter is the finest mechanical stage of the AAF range. The coalescing 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 AAFS filter comes in 15 sizes with G 1/4" to 3" threads and flows of 417 to 46,000 l/min at 7 bar. It is one of the stages of the AAF filters — the housing is the same for all stages, only the element differs.
AAFS filters by size
The size number is the flow in Nm³/h at 7 bar. Each filter has a spare element, connection kits and a housing without element for your own combination.
| AAFS filters, elements and accessories by size | ||||||
|---|---|---|---|---|---|---|
| Filter | Connection | l/min at 7 bar | Nm³/h | Spare element | Connection kits | Housing without element |
| AAFS-25 | G 1/4" | 417 | 25 | AAFS-25V | M series | AAF-25T |
| AAFS-30 | G 3/8" | 500 | 30 | AAFS-25V | M series | AAF-30T |
| AAFS-35 | G 1/4" | 583 | 35 | AAFS-35V | L series | AAF-35T |
| AAFS-60 | G 3/8" | 1,000 | 60 | AAFS-35V | L series | AAF-60T |
| AAFS-78 | G 1/2" | 1,300 | 78 | AAFS-78V | L series | AAF-78T |
| AAFS-120 | G 3/4" | 2,000 | 120 | AAFS-120V | L series | AAF-120T |
| AAFS-198 | G 1" | 3,300 | 198 | AAFS-198V | XL series | AAF-198T |
| AAFS-335 | G 1" | 5,583 | 335 | AAFS-335V | XL series | AAF-335T |
| AAFS-510 | G 1 1/2" | 8,500 | 510 | AAFS-510V | XL series | AAF-510T |
| AAFS-780 | G 1 1/2" | 13,000 | 780 | AAFS-780V | XL series | AAF-780T |
| AAFS-1000 | G 2" | 16,667 | 1,000 | AAFS-1000V | – | AAF-1000T |
| AAFS-1500 | G 2" | 25,000 | 1,500 | AAFS-1500V | – | AAF-1500T |
| AAFS-1680 | G 2 1/2" | 28,000 | 1,680 | AAFS-1500V | – | AAF-1680T |
| AAFS-2160 | G 3" | 36,000 | 2,160 | AAFS-2160V | – | AAF-2160T |
| AAFS-2760 | G 3" | 46,000 | 2,760 | AAFS-2760V | – | AAF-2760T |
Sizes 25 and 30, 35 and 60, and 1500 and 1680 share the same element. Connection kits cover sizes up to 780. You will find the dimensions and weight on the product page of each filter.
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When to use it
The AAFS microfilter suits all applications where the air must be very clean of particles and oil. It is also the mandatory stage before activated carbon, adsorption, catalytic and molecular sieve filters — only with it does their solid particle class 1 apply.
The AAFM fine pre-filter, which traps particles and oil down to 0.1 µm, goes before the AAFS microfilter — the microfilter element then lasts longer.
Where to place it
After the AAFM fine pre-filter, before the AAFA activated carbon filter.
Flow by pressure
The catalogue flows apply to a pressure of 7 bar, an ambient temperature of +20 °C and an air inlet temperature of +35 °C. At a different pressure, the flow changes according to the correction factor.
| AAFS filter flow in l/min by pressure | ||||||
|---|---|---|---|---|---|---|
| Size (thread) | 4 bar | 6 bar | 7 bar | 10 bar | 12 bar | 16 bar |
| 25 (G 1/4") | 263 | 367 | 417 | 575 | 680 | 888 |
| 30 (G 3/8") | 315 | 440 | 500 | 690 | 815 | 1,065 |
| 35 (G 1/4") | 367 | 513 | 583 | 805 | 950 | 1,242 |
| 60 (G 3/8") | 630 | 880 | 1,000 | 1,380 | 1,630 | 2,130 |
| 78 (G 1/2") | 819 | 1,144 | 1,300 | 1,794 | 2,119 | 2,769 |
| 120 (G 3/4") | 1,260 | 1,760 | 2,000 | 2,760 | 3,260 | 4,260 |
| 198 (G 1") | 2,079 | 2,904 | 3,300 | 4,554 | 5,379 | 7,029 |
| 335 (G 1") | 3,517 | 4,913 | 5,583 | 7,705 | 9,100 | 11,892 |
| 510 (G 1 1/2") | 5,355 | 7,480 | 8,500 | 11,730 | 13,855 | 18,105 |
| 780 (G 1 1/2") | 8,190 | 11,440 | 13,000 | 17,940 | 21,190 | 27,690 |
| 1000 (G 2") | 10,500 | 14,667 | 16,667 | 23,000 | 27,167 | 35,501 |
| 1500 (G 2") | 15,750 | 22,000 | 25,000 | 34,500 | 40,750 | 53,250 |
| 1680 (G 2 1/2") | 17,640 | 24,640 | 28,000 | 38,640 | 45,640 | 59,640 |
| 2160 (G 3") | 22,680 | 31,680 | 36,000 | 49,680 | 58,680 | 76,680 |
| 2760 (G 3") | 28,980 | 40,480 | 46,000 | 63,480 | 74,980 | 97,980 |
Element, drain and maintenance
Element: borosilicate microfibres, pressure drop of a new element 80 mbar. Working temperature +1.5 to +65 °C, pressure up to 16 bar.
The AOK16B float drain releases the condensate from the bowl on its own. You will find other drains among the condensate drains for filters.
Replace the element at a pressure drop of 350 mbar, at the latest every 12 months or 4,000 operating hours. Clogging is shown by the indicator or differential pressure gauge on the filter head.
Spare elements for all stages are among the AAF elements; connection kits join the filters into a bank and fix them to the wall.
Elements and accessories for AAFS filters
Ventilek’s tip
No carbon without an S microfilter. The activated carbon after it only deals with vapours and odours. If it received oil droplets, it would quickly become saturated.
- What purity does the AAFS microfilter provide?
- Particles down to 0.01 µm and residual oil below 0.01 mg/m³, class 1-x-1 according to ISO 8573-1.
- Does it have to go before activated carbon?
- Yes. Solid particle class 1 for stages A, A2, H2 and MS2 only applies when an S microfilter is installed before them.
- When should the element be replaced?
- At a pressure drop of 350 mbar, at the latest after 12 months or 4,000 operating hours.
Product sorting
List of products
With a G 1/4" thread and a flow of 583 l/min at 7 bar, the AAFS-35 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
Spare element AAFS-335V for microfilter AAFS-335. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-78V for microfilter AAFS-78. Recommended replacement every 12 months or 4,000 operating hours.
With a G 3/8" thread and a flow of 1,000 l/min at 7 bar, the AAFS-60 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 3/8" thread and a flow of 500 l/min at 7 bar, the AAFS-30 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
Spare element AAFS-35V for microfilters AAFS-35 and AAFS-60. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-120V for microfilter AAFS-120. Recommended replacement every 12 months or 4,000 operating hours.
With a G 3/4" thread and a flow of 2,000 l/min at 7 bar, the AAFS-120 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
Spare element AAFS-510V for microfilter AAFS-510. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-780V for microfilter AAFS-780. Recommended replacement every 12 months or 4,000 operating hours.
With a G 2" thread and a flow of 25,000 l/min at 7 bar, the AAFS-1500 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 2 1/2" thread and a flow of 28,000 l/min at 7 bar, the AAFS-1680 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a G 1" thread and a flow of 3,300 l/min at 7 bar, the AAFS-198 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 1 1/2" thread and a flow of 13,000 l/min at 7 bar, the AAFS-780 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³....
With a G 1/4" thread and a flow of 417 l/min at 7 bar, the AAFS-25 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
Spare element AAFS-1000V for microfilter AAFS-1000. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-1500V for microfilters AAFS-1500 and AAFS-1680. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-2160V for microfilter AAFS-2160. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-2760V for microfilter AAFS-2760. Recommended replacement every 12 months or 4,000 operating hours.
With a G 2" thread and a flow of 16,667 l/min at 7 bar, the AAFS-1000 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 1" thread and a flow of 5,583 l/min at 7 bar, the AAFS-335 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 1 1/2" thread and a flow of 8,500 l/min at 7 bar, the AAFS-510 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
Spare element AAFS-25V for microfilters AAFS-25 and AAFS-30. Recommended replacement every 12 months or 4,000 operating hours.
Spare element AAFS-198V for microfilter AAFS-198. Recommended replacement every 12 months or 4,000 operating hours.
With a G 3" thread and a flow of 36,000 l/min at 7 bar, the AAFS-2160 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 3" thread and a flow of 46,000 l/min at 7 bar, the AAFS-2760 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...
With a G 1/2" thread and a flow of 1,300 l/min at 7 bar, the AAFS-78 microfilter traps particles larger than 0.01 µm, water and oil; residual oil is below 0.01 mg/m³. Working...