Air Filter
Mechanical device that removes contaminants from the air stream.
Pre Filter
Technical Specifications:
- Frame: Cassette type/ Flange type
- Operating Temp.: Up to 100⁰ C
- Operating Humidity: 100% RH
- Face Velocity: 2.5 m/s
- Filtration Rating: Up to 90% down to 10 µm
- Initial Pressure Drop : 2.5 mm WC at rated flow
- Final Pressure Drop: 7.5 mm WC
- Testing: As per BS 2831/EN 779
- Construction: Aluminium, G.I. or S.S
Media:
• HDPE or non-woven symthetic media stitched with one layer of G.I. and crimped to required depth to provide larger filtration area
• Crimps separated by aluminium or S.S. spacers for uniform distribution of flow
• All these filters are washable and cleanable with very high service life
Fine Filter
Technical Specifications:
- Frame: Cassette type/ Flange type
- Operating Temp.: Up to 100⁰ C
- Operating Humidity: Up to 100% RH
- Face Velocity: 1.25 m/s for 150 mm thick & 2.5 m/s for 300 mm thick
- Filtration Rating: Upto 99% down to 5 µm
- Initial Pressure Drop : 6 mm WC at rated flow
- Final Pressure Drop : 18 mm WC
- Testing: As per BS EN 779
- Construction: Aluminium, G.I. or S.S.
Media:
• Compressed woolen felt or synthetic needle felt supported by G.I. wire netting stitched together and crimped to required depth to provide larger filtration area
• Crimps separated by aluminium or S.S. spacers for uniform distribution of flow
• All these filters are washable and cleanable with very high service life
CORRELATION BETWEEN PARTICLE SIZE EFFICIENCY, EUROVENT 4/5, EN779, ASHRAE 52.1 AND ASHRAE 52.2 RATINGS
| Eurovent 4/5 | EU3 | EU4 | EU5 | EU6 | EU7 | EU8 | EU9 |
| EN 779 | G3 | G4 | F5 | F6 | F7 | F8 | F9 |
| Arrestance | 60 to 80% | 80 to 90% | 90 to 95% | 95 to 98% | >98% | >98% | >98% |
| Dust spot efficiency | < 20% | 20 to 35% | 40 to 55% | 60 to 80% | 80 to 90% | 90 to 95% | >95% |
| MERV | 5,6 | 7,8 | 9,10 | 11,12 | 13 | 14 | 15 |
| % Min. PSE @ 10 micron | 90 | 98 | 100 | 100 | 100 | 100 | 100 |
| % Min. PSE @ 5 micron | 75 | 80 | 95 | 98 | 100 | 100 | 100 |
| % Min. PSE @ 3 micron | NA | NA | 85 | 90 | 95 | 98 | 100 |
| % Min. PSE @ 1 micron | NA | NA | 55 | 70 | 85 | 90 | 95 |
| % Min. PSE @ 0.5 micron | NA | NA | 35 | 50 | 65 | 75 | 85 |
| % Min. PSE @ 0.3 micron | NA | NA | 20 | 40 | 50 | 60 | 70 |
HEPA (High-Efficiency Particulate Aerosol)
HEPA filter has a minimum particle collection efficiency of 99.97% for particles 0.3 microns in diameter.
Technical Specifications:
- Frame: Cassette type/ Flange type
- Media: 100% fibre glass media having deep pleats
- Operating Temp.: Up to 100⁰ C
- Operating Humidity: Up to 100% RH
- Face Velocity: 0.75 m/s for 150 mm thick & 1.25 m/s for 300 mm thick
- Initial Pressure Drop : Less than 25 mm WC
- Final Pressure Drop : Up to 75 mm WC
- Testing: As per BS EN 779
- Construction: Aluminium, G.I. or S.S.
ULPA (Ultra Low Penetration Aerosol)
ULPA filter has an efficiency of 99.999% for particles 0.12 micron or larger size at the specified media velocity. The most penetrating particle size is the particle diameter when penetration through the media is highest.
SULPA (Super ULPA)
At an efficiency of 99.9999% these filters are based on the same standard as the ULPA filters.
Ultimate ULPA
At an efficiency of 99.9999999% these filters are based on the same standard as the ULPA filters.
RATING COMPARISON FOR HEPA AND ULPA FILTERS
| EN 1822 FILTER CLASS | % MPPS EFFICIENCY | EFFICIENCY AS PER IEST-RP-CC-034.1 |
| H 10 | 85 | 95% @ 0.3 microns |
| H 11 | 95 | 99.9% @ 0.3 microns |
| H 12 | 99.5 | 99.97% @ 0.3 microns |
| H 13 | 99.95 | 99.99% @ 0.3 microns |
| H 14 | 99.995 | 99.999% @ 0.3 microns |
| U 15 | 99.9995 | 99.9975% @ 0.12 microns |
| U 16 | 99.99995 | 99.99975% @ 0.12 microns |
| U 17 | 99.999995 | 99.999975% @ 0.12 microns |
AIR FILTERS – PERFORMANCE SPECIFICATION
| FILTER GRADE | FILTER SIZE IN MM | AIR FLOW CAPACITY | INITIAL PRESSURE DROP |
| Pre filter 90% efficiency @ 10 microns (G3) | 610 x 610 x 48 | 1150 CFM | 4 mm WC |
| Fine filter 95% efficiency @ 5 microns (F5) | 610 x 610 x 150 610 x 610 x 300 |
1000 CFM 2000 CFM |
7 mm WC 7 mm WC |
| Fine filter 95% efficiency @ 3 microns (F7) | 610 x 610 x 150 610 x 610 x 300 |
1000 CFM 2000 CFM |
12 mm WC 12 mm WC |
| Fine filter 95% efficiency @ 1 microns (F9) | 610 x 610 x 150 610 x 610 x 300 |
1000 CFM 2000 CFM |
15 mm WC 15 mm WC |
| Super fine filter 70% efficiency @ 0.3 microns (H10) | 610 x 610 x 295 | 2000 CFM | 15 mm WC |
| Hepa filter (Deep pleat) 99.99% efficiency @ 0.3 microns (H13) | 610 x 610 x 145 610 x 610 x 295 |
625 CFM 1275 CFM |
18 mm WC,br>18 mm WC |
| Hepa filter (Mini pleat) 99.99% efficiency @ 0.3 microns (H13) | 610 x 610 x 70 | 625 CFM | 18 mm WC |
| High flow Hepa filter (H13) 99.97% efficiency @ 0.3 microns | 610 x 610 x 295 610 x 610 x 295 |
2000 CFM | 25 mm WC |