Shenzhen Excel Industrial Co., Ltd.

ESP Air Purifier
An electrostatic precipitating (ESP or Plasmas) air purifier is usually composed of
a charging section and a collection section. The charging section uses high-voltage wires to impart a positive charge to the incoming pollutant particles. The charged particles are then drawn into a secondary electric field, where they are collected on a series of metal plates carrying the opposite charge. Clean air is then re-circulated back into the general air stream. It can capture particles in a range of 0.01 micron to 1 micron. Some ESP air purifier add a fan to enhance the draw-in efficiency, just like our model 939, 9088, 9079E, etc.
ESP Air Purifier has advantages of high cleaning efficiency, low power consumption, no filter replacement. However, ESP Air Purifier can produce small amounts of ozone as a by-product and it must utilize some filter technology to reduce the concentration of ozone.

HEPA Air Purifier
HEPA is an acronym for "high efficiency particulate air". Basically HEPA is a type of filter that can trap a large amount of very small particles. HEPA are made from very tiny material and are made into a tightly corrugation. This creates a filter consisting of a multitude of very small sieves that can capture extremely small particles. Once trapped, pollutants and particles are not able to flow back into circulation, due to the highly absorbent pores of HEPA. Now we can frequently meet three kinds of HEPA Air Purifier at market.
“True HEPA” Air purifier ---
True HEPA filter is able to trap at least 99.97 percent of particles of 0.3 microns. True HEPA filter may be more expensive than other HEPA filters. Moreover, True HEPA filter after using for a period must be disposed, can not be washed or cleaned to use it again.
“HEPA Type” Air Purifier ---
HEPA type filter may be made in similar ways to true HEPA filter and may even resemble it. HEPA type filter do not has to meet the same standards as true HEPA filter. It often captures only 60 to 90 percent of particles and that percent can fall even lower for particles of 1 micron and below. HEPA type filter is less expensive than true HEPA filter, however, HEPA type filter just same as true HEPA filter, after using for a period it must be disposed, can not be washed or cleaned to use it again.
“Permanent HEPA” Air Purifier ---
On filtering efficiency, permanent HEPA filter can be looked to true HEPA filter. It is able to trap at least 99.97 percent of particles of 0.3 microns. The most advantage of permanent HEPA filter is that it is cleanable then can be used again.