To confirm the air purifier model name or to find out which filters are compatible with your unit, you can check the identifying information for your air purifier on the product label at the bottom of your machine.
Please unplug your air purifier, then carefully lay it on its side. On the bottom of your unit, you will find a sticker with the MAC address and serial number for your machine.
If your air purifier is connected to the Blueair app you can additionally view the MAC address by selecting your air Purifier in the app and navigating to Product Settings > Product Information. 
Once you know your model number you can go to https://www.blueair.com/us/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 your filter as needed.
Alternatively, if you already know your serial number, you can go to https://www.blueair.come/us/contact-us-page.html and select "Help me find a replacement filter." Enter your serial number, and compatible filters for your model will be shown to you.
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