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Compact filters do remove very fine particles from the air stream, but the smallest are filtered by absolute filters. For some applications compact filters are sufficient, like in many HVAC systems and in food industry. But in other cases higher standards are required, like in laboratories, clean rooms and hospitals. In such cases compact filters are uses as pre-filters after which the smaller particles are removed by the finer absolute filters.
There are 3 different classes of absolute filters: EPA (Efficient Particulate Air), HEPA (High Efficiency Particulate Air) and ULPA (Ultra Low Penetration Air filters). The last one is the most efficient in removing the smallest particles. Below an overview:
| KIND OF FILTER | FILTERS PARTICLES DOWN TO: | WITH AN EFFICIENCY OF: |
| Compact filters | 1 micron | 50 to 80 % |
| Absolute filters: EPA-filters | 0,1 to 0,3 micron | 85 to 99,95 % |
| Absolute filters: HEPA-filters | 0,1 to 0,3 micron | 99,95 to 99,9995 % |
| Absolute filters: ULPA-filters | 0,1 to 0,3 micron | 99,9995 to 99,999995 % |
All such filters have to comply with the highest demands. Solana is where to go for professional advice and/or a very competitive price offer
| Design: | V-construction with minipleated filter material |
| Filter material: | Moisture-resistant micro glass fibre paper |
| Properties: | Temperature resistant up to 70 °C, maximum final resistance of 450 Pa |
| Frame: | Anti-shock plastic, 25 mm thick, compatible with all standard frames |
| M6 | ePM10 70% | energy class C | initial resistance 60 - 95 Pa |
| F7 | ePM1 55% | energy class A+ | initial resistance 70 - 105 Pa |
| F8 | ePM1 70% | energy class A+ | initial resistance 80 - 115 Pa |
| F9 | ePM1 80% | energy class A+ | initial resistance 105 - 140 Pa |
Mounting depth is always 292 mm.
| SIZES | FILTER AREA | NOMINAL FLOW RATE |
| 592 x 592 mm | 18 m² | 3400 - 4250 m³ / h |
| 490 x 592 mm | 14,5 m² | 2700 - 3500 m³ / h |
| 287 x 592 mm | 8,5 m² | 1700 - 2125 m³ / h |
Our high quality compact filters surpass many providers in filter efficiency. Still, our prices are highly competitive. It won't cost you a dime to ask quickly for a price offer!
| Design | Very solidly built casing in galvanised steel or MDF wood |
| Filter material | minipleated micro glass fibre paper |
| Filter class | E11 up to H14 (EN 1822:2009) |
| Test | Each filter is provided with an individual test certificate |
Mounting depth is always 292 mm.
| SIZES | FILTER AREA | NOMINAL FLOW RATE |
| 305 x 305 mm | 10 m² | 1000 m³/h |
| 305 x 610 mm | 21 m² | 2000 m³/h |
| 457 x 610 mm | 31 m² | 3000 m³/h |
| 610 x 610 mm | 42 m² | 4000 m³/h |
| 762 x 610 mm | 52 m² | 5000 m³/h |
| 288 x 593 mm | 20 m² | 1800 m³/h |
| 490 x 593 mm | 30 m² | 2700 m³/h |
| 593 x 593 mm | 40 m² | 3600 m³/h |
We also provide absolute filters designed as a panel filter in a frame of extruded and anodized aluminium with a depth of 68, 78, 88 or 150 mm. They are available in filter classes E11 to U15 in all standard sizes.
Solana provides your absolute filters with the greatest care. Ask today your price offer for our filters at very competitive prices.
All our filters are tested by independent laboratories to all common standards. Moreover, our absolute filters are provided with an individual test certificate.
This method measures the efficiency of filtering particles of 0,4 µm and designates a score of 1 up to 9 with a matching letter: G1, G2, G3 and G4 for coarse filters, M5 and M6 are in the middle, and F7, F8 and F9 are the finest filters. However, this standard is used less and less because the test doesn't match 100% with real circumstances: mostly the filtered air contains particles of different sizes.
This test has become the new standard method and is more accurate than EN 779. Testing is done for 4 different particle sizes: for 1 µm, for 2,5 µm, for 10 µm and for bigger as 10 µm. For each of these sizes is checked whether more as 50% is effectively filtered, and if so, the filter receives a ISO-classification for this particle size. The respective classifications are ePM1; ePM2.5, ePM10 and Coarse. Behind this classification the percentage of filter efficiency is stated.
Example: When a filter material received the classification "ePM1 70%", it means that 70% of the particles up to 1 micron are effectively filtered.
This testing method measures finer particles than those measured in ISO 16890, namely particles of 0,1 to 0,3 micron. Depending on the effeciency of the filter material a score is given from 10 up to 17 with a matching letter: the higher the number the higher the efficiency. Filter media can get one of the following classifications:
Below a handy overview about the classification of compact filters:
| EN 779 | ISO 16890 | ISO Efficiëncy | Applications for compact filters |
| G1 | ISO Coarse | < 20% | Base filtration of coarse particles like sand and hair |
| G2 | ISO Coarse | 20 - 40% | Pre-filtration in industriële systems |
| G3 | ISO Coarse | 40 - 60% | Protection of heat exchangers and fans |
| G4 | ISO Coarse | 60 - 80% | Basic dust filters, Prefiltration in HVAC-systems |
| M5 | ePM10 | 50 - 70% | Standard fine dust filters in shops and offices |
| M6 | ePM2.5 | 50 - 70% | Better air quality in workplaces and buildings |
| F7 | ePM1 | 50 - 65% | Good fine dust protection, standard in offices and schools |
| F8 | ePM1 | 70 - 80% | High quality indoor air (hospitals, HVAC) |
| F9 | ePM1 | 80 - 95% | Clean air applications, Pre-filtration for HEPA filters |
Below a summary table about the classification for absolute filters. The mentioned efficiency is about filtration of particels from 0,1 to 0,3 µm
| EN 1822 | Type | Efficiëntie | Toepassingen voor absoluutfilters |
| E10 | EPA | > 85% | Basic air filtration, air purifiers, vacuum cleaners |
| E11 | EPA | > 95% | Standard clean air applications, HVAC systems |
| E12 | EPA | > 99.5% | High quality air purification, Industrial applications |
| H13 | HEPA | > 99.95% | Hospitals, laboratories, clean rooms, pharmacy |
| H14 | HEPA | > 99.995% | Operation rooms, sterile rooms, high-tech production |
| U15 | ULPA | > 99.9995% | Advanced clean rooms, production of micro-electronics |
| U16 | ULPA | > 99.99995% | High-end cleanrooms, semi conductor industry |
| U17 | ULPA | > 99.999995% | Nuclear applications, ultra pure laboratory work |
In this vast world of filtration Solana has accumulated years of expertise. We are happy to help you with advice or a price offer.