So confused to hv read all those air purifier n ioniser company has advertised that how their air device products works. But never has shown any scientific proud about it. Even those make in Taiwan are selling at around rm1k now. I hv read smwhere in the wiki said air purifying device are making the situation even worsens. Cos the filtration may failed at a very short time, Which may hv cost us a bomb to hv replace it within a few week? So is does not make any sense of the miracle devices can do any job, is was the cosy filter only. If we hv rm4k+ to spend, the best way is we invest to build a water treatment ventilation systems at our home anyway. Why a an uncompromising devices?