BLUEAIR純正Blue Pure F3MAX交換用フィルター 311i Max空気清浄機用 - AHAM認定、HEPASilentデュアルフィルター、粒子と臭いを99.97%除去、純正カーボンフィルター。

The Blue Air air purifier tells you when to replace the filter, as per the specs it's about after 6-9 months of use. I replaced mine almost one year later, after purchasing my 311i max air purifier. I prefer only using a genuine replacement filter, maybe this is why it lasted so long. I also remove the outer material covering the filter about every 3 months and wash and dry it, to remove the dust. I love this air purifier, the 311imax is in an open space covering about 1,000 sq ft. It really kicks up and get rid of the smell when I fry foods like fish etc. I also have Blue Air 411i max in the bedroom.

Quiet and it really does a superb job.

Great! Easy to install!

Not much to tell but it does replace factory filter perfectly (the biggest unknown with online) and seems to work as well.

these are the real deal very good filters