To confirm your air purifier model or filter model, you can check the product label on your air purifier.

The serial and model numbers can be found on the product label located on the back of the air purifier.

To check the MAC address, remove the bottom pre-filter to access the MAC label.
If your air purifier is connected to the Blueair app, you can additionally view the MAC address by selecting the air purifier name and navigating to Product Settings › Product Information.

Once you know your model number, you can go to https://blueair.co/collections/air-purifier-filters. Scroll down and select the model you have. All compatible filters and pre-filters will then be displayed. You can then click and order.