The utility model provides a security that air purifier can improve the filter in when maintenance. This air purifier includes: plenum chamber (2), configuration air supply fan (20) in this plenum chamber (2), dust collection filter (31), this dust collection filter (31) dispose in the leeward side of plenum chamber (2), and sealing (6), seal between to dust collection filter (31) and plenum chamber (2) this sealing (6), and dust collection filter (31) constitute for installing and pull down from the position of leaning on the leeward to incline than sealing (6).
