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HEPA Filters
Table of Contents
Introduction to HEPA Filters
AXENIC SYSTEMS (established in 1995) are certified manufactures and suppliers of HEPA Filters in India. Our HEPA Filters are known for low resistance, great dust holding capacity and fine consistency of air velocity. We can deliver with as many as essentials to suit your contamination control needs irrespective of what you have in place is a modular, hard wall, or softwall clean room.
HEPA is a kind of pleated mechanical air filter. It is an abbreviation for “high efficiency particulate air [filter]. This kind of air filter can ideally remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (µm). HEPA Filters have layers made of small, adhesive fiberglass fibres that are intertwined.
HEPA (High Efficiency Particulate Air) is a filtration system that is used to remove contaminants or particulates from the air in a cleanroom. When installed, it will contribute significantly to maintaining or increasing air hygiene levels.
HEPA filter working
HEPA filters capture air contaminants with the help of a complex web of fibres. This can happen either by Inertial Impaction, Sieving, Diffusion or Interception, depending on the size of the contaminant/element.
Minor particles dissipate as they travel through the filter until they collide with a fibre and are confined. Medium sized particles are also taken by fibres in the filter through interception. Larger contaminants are trapped via inertial impaction and sieving. This combination act will help in keeping the cleanroom’s air protected from all three classes of contaminants.
Specifications of HEPA Filters
| Filter Type | HEPA Filter |
| Efficiency | 99.999 % down to 0.3 microns |
| Frame Material | Stainless Steel, G.I., Aluminium |
| Filtration Capacity (microns) | 0.25-0.5 |
| Filter Dimensions (cm X cm X cm) | 60 cm X 60 cm X 30 cm |
| Flow Capacity Range | 500-1000 cfm, 1000-1500 cfm, 1500-2000 cfm, >2000 cfm |
| HEPA Filter Type | Type B, Type A, Type C, Type D |
Types of HEPA Filters
Fan Powered HEPA Filters
Instead of selecting for terminal air filtration units, many are now going for self-powered air filter modules because of their easy installation and overall flexibility. A regular fan powered HEPA filter features variable speed control and is characteristic of most cleanroom designs. A fan powered HEPA filter features power indicator lights that can be used to monitor the constant operation of the cleanroom air filter.
Terminal Diffusers
This kind of HEPA filter module is usually hung from t-bar ceilings to deliver unidirectional airflow. The HEPA air filter efficiency module is rated at 99.99% at 0.3 microns.
Low-Profiled HEPA Filters
In circumstances where fitting in a standard size air filter module above the room will be problematic or simply impossible, a low profiled HEPA filter is a feasible alternative. Low-profile HEPA filtration modules feature twin motorized impellers that provide a minimalistic package with a total height of only 9.5 inches. They are perfect for cleanrooms that are short on space.
Applications:
HEPA filters are used in applications that need contamination control, such as the manufacturing of medical devices, hard disk drives, semiconductors, nuclear, food and pharmaceutical products, as well as in hospitals, homes, and vehicles.
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