All Blueair purifiers come with a one (1) year Limited Warranty. To extend the Limited Warranty from one (1) year to two (2) or more years (depending on your model, check the product pages of your purifier for additional warranty specifics), complete the Product Registration form in the 'My Units' section of your customer account, within (60) days of purchase or register through the Blueair mobile app. If this is not completed within 60 days of purchase, Blueair may deny your warranty claim.