1. Physical purification is preferred

Except formaldehyde air purifiers generally have three purification methods: physical purification, anion purification and electrostatic dust collection purification, preferably physical purification, no secondary pollution, the latter two purification methods, easy to produce ozone.

2. High CADR value and high CCM value

CADR value represents the ratio of clean air output per unit time, and represents the purification efficiency of the air purifier. The higher CADR value, the higher the purification efficiency of the purifier.CCM value represents the total weight of accumulated purifying pollutants (particulate matter or formaldehyde) when the amount of clean air decays to 50%, and represents the continuous purification capacity of air purifier. The larger CCM value is, the longer the service life of air purifier filter screen is.Therefore, these two indexes can be taken into account when selecting air purifier for removing formaldehyde.

3. Filter mesh optimization HEPA+ modified activated carbon composite

Currently, HEPA filter has the best effect on PM2.5 filtration, while high-quality modified activated carbon can effectively remove TVOC, formaldehyde, toluene, etc.As for the current market, A.O. Smith deformaldehyde air purifier adopts HEPA high-efficiency composite filter element, which is made of high-efficiency HEPA and 2 layers of high-quality modified activated carbon.It can effectively remove PM2.5, formaldehyde, toluene, TVOC, etc.