1 see purifier effect: not only to see the report of the experiment, to see the actual effect of the actual work. Not satisfied with the return of the best products.
2 to see the scope of use: not only in the bedroom, small space before the effect of good products, should be bought in large space, living room, lobby, waiting room can be used in high efficiency products.
3 look at the noise: can not affect the work and rest due to noise. Should buy noise free products. Four
Look at the late input: not frequent replacement of the treatment of materials, resulting in a larger late spending. Should buy no later put into the product.
4 look at the green environmental protection: the use of the purifier when the power consumption is large, the election into the two pollution. Should not buy the power consumption of products.