Blueair 311i+ Max Air Purifier F3MAX+ Replacement Filter

Blueair Pure F3MAX+ replacement filter for 311i+ Max. Easy to change and install. Ordered subscription for the wrong filters (I have a 311i Max, not a 311i+ Max) and opened the first filter before realizing my mistake. This listing is for TWO filters, one box completely sealed from the manufacturer and one is new in opened box. I will reseal and secure the open packaging with tape before shipping. Pet and smoke free home. Never used, simply an incorrect item that did not fit my Blueair purifier.