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The purification efficiency is that how many contaminated air can be removed. HEPA filter is that which can be removed by 99.97% with dust as small as 0.3§­ but purification efficiency is of various kinds despite consumers use these filters. The difference of efficiency of air cleaner which used HEPA filter is due to adoption of inferior HEPA filter ,manufacturing problem, poor air-tightness inside of air cleaner

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Even though purification technology of air cleaner is excellent, the ability to purify given area within nomal time should be processed. The powerful motor and large area of filter is necessary to satisfy these.

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The main contaminators are Formaldehyde, dioxin, radon gas, ammonia and benzene which are generated from funiture, adhesives, wall papers, paint, carpet and concrete continuously. Theses gaseous substances weaken human nervous system, disturbs human immune system, and finally induce serious diseases such as cancer, allergy, asthma and atopy etc. Better air cleaners employ VOC-exclusive filters to absorb and remove these harmful gases.

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Every conductor which is turned by electric current generates an electron waves. The armoring of air cleaner which is used in demostic and foreign market is made of plastic and exposed by these electron waves for a long time. However, electron waves can be intercepted in case of steel-made armoring.

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Air cleaner should be operated as that of first purchasing after 5-10years The important thing in case of durability is very life span of motor.

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If air cleaner is not maintained despite you use excellent filter, not only the function is not well operated but also harm to you and your family's health.

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The filter of air cleaner should be replaced and the cost is needed of course. The performance as well as life span of air cleaner depend on how well maintain air cleaner. Accordingly, It is very important that how well maintain air cleaner and how well filters fucntion together with mainteance cost.

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Air cleaners possess various additional functions as well as an air purification function. Ozone-related matters for negative ion type air cleaners and germ-generating frequency for humidification function should be checked, and also whether the air cleaner possesses a mute function and a night silence function.

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You should consider manufacturs deeply in case you buy air cleaner because it is related to health of users. You should check quality, after service, technology and degree of consumer's satisfaction at first when you purchase air cleaner.