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High efficiency air filters (HEPA) and ultra low penetration air filters (ULPA-filters) which are used in the field of ventilation and air conditioning and for technical processes, e.g. for applications in clean room technology or industrial application. HEPA filters remove a broad range of airborne contaminants, including fine dust, smoke, soot and pollen. HEPA filters prevent nearly all airborne contaminants from entering or leaving critical spaces. HEPA filters remove a minimum of 99.97% @ 0.3 micron particles from airstreams, while ULPA filters remove at least 99.999% @ 0.12 micron particles from the air. Filters are installed where the maximum of air cleanliness is demanded. They are needed on the air intake side for the separation of suspended matters (viruses, germs, toxic types of dust, aerosols). We have different versions and dimensions available, whereby the filter media is always high-quality, high efficiency and super homogeneous glass fibre paper with different degrees of separation. HEPA filters are used in final filter applications including hospitals, electronics, nuclear, pharmaceuticals, laboratories, aerospace, food processing and optics. They can also be used as pre-filters in cleanroom environments and other critical applications.
What is HEPA Filter?
HEPA is an acronym that stands for High Efficiency Particulate Air, so a HEPA filter is a High Efficiency Particulate Air filter. Filters, whether for an air purifier or other implementation, come with many benefits and claims.
What sets HEPA filters apart from the rest is their claims are more than just claims. Because in order to be called a true HEPA filter it has to be first be tested and approved, you know exactly what to expect. IIT Delhi dictates that a HEPA filter must trap 99.97% of particulates 0.3 microns or larger. This does not mean that the filter cannot trap particles smaller than 0.3 microns, because many HEPA filters can; it is simply the threshold that must be reached in order to carry the HEPA name.
What is a micron?
Particles range from ultra-microscopic to entirely detectable to the human eye. Microns, which are one-millionth of a meter, are how particles are measured. To give you a better idea of the size of a micron, or less than a micron, consider that we cannot visually see anything less than 10 microns. Bacteria can be anywhere from 0.3 to 60 microns, and 1 inch equals 25,400 microns.
Micron Comparison Chart:
Spores: 3 – 40 microns
Mold: 3 – 12 microns
Bacteria: 0.3 – 60 microns
Car emissions: 1 – 150 microns
Pure oxygen: 0.0005 microns
How do HEPA Filters Work?
To put it simply, HEPA filters trap air contaminants in a complex web of fibers. Depending on the size of the particle, this can happen in four different ways: Inertial Impaction, Diffusion, Interception, or Sieving.
Larger contaminants are trapped via inertial impaction and sieving. The particles either collide with the fibers and become trapped or are trapped while attempting to travel through the fibers. Medium sized particles, as they move through the filter, are grabbed by the fibers via interception. Smaller particles are dissipated as they travel through the filter and eventually collide with a fiber and are trapped.