About buyers FAQ: 1, accessory is not genuine? Answer: No, but it can be used to achieve better results. 2, after receiving not satisfied with how to do? Answer: unopened retreat, buyers bear the return shipping costs themselves; no refund after unpacking. 3. Why cheaper than other parts of your home original so much? Answer: Our company is specialized in the production of industrial air filtration manufacturer, all the raw materials are available, not the pursuit of profit, just to raise awareness. HEPA filter HEPA is to achieve a standard HEPA filter, to 0.1 micron and 0.3 micron effective rate of 99.7%, the characteristics of HEPA air network is through, but small particles can not pass. It has a diameter of 0.3 microns (1/200 the diameter of the hair) or more particle removal efficiency of 99.97%, is the smoke, dust and bacteria and other pollutants most effective filtration media. HEPA points PP filter paper, glass fiber, composite PP PET filter, meltblown and meltblown non-woven polyester glass fiber five materials. Features: wind resistance, dust holding capacity, high filtration precision, can be processed into various sizes and shapes according to the customer, for the use of different models. HEPA is currently mainly used for household cleaning machines, vacuum cleaners, medical purification machines.