... Anion Density:200,0000pcs/cm3, 300,0000pcs/cm3, 400,0000pcs/cm3, 400,0000pcs/cm3(4)Aproval Cert:CQC,UL,CE2. ... ion generator produces a large number of negative ions will produce small quantities of ozone, the combination of both can easily ... of a negative ion generator, it is recommended to accept the manufacturers to factory site installation guide. Anion generator for Air Purifier and Air Clearner