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@bleistifterin
It’s one filter for the whole room, one of these:
https://www.winixamerica.com/product/5500-2/

We also have the predecessor of this one at home; can recommend: https://www.winixamerica.com/product/d360/

Both are cheaper from 3rd parties instead of direct from Winix.

With all these, ignore the putative “room size;” the CADR (clean air delivery rate) is the stat to look for.