When you sign up for the auto-ship filter subscription service, any Protect models that are enrolled in the Blueair app will be automatically signed up for the auto-ship filter service.
The Blueair auto-ship service will automatically know exactly which model of Blueair unit you currently own. So when it is time to replace your filter, your unit will send us all the information to know exactly which filter you need and send it to you at the appropriate time (based on our algorithm) to keep you breathing clean air.