The following steps must be taken to be in compliance with the Limited Lifetime warranty: You submit your warranty registration to Medify Air within 30 days of purchase (link to warranty sign up page - hyperlink warranty registration) You use a proper power supply based on the voltage outlined in your product manual. There is no evidence of tampering, mishandling, neglect, accidental damage, modification, and/or repair done to the Medify Air Purifier by anyone other than an authorized Medify Air service personnel. Your air purifier is being used in accordance with the product manual The Limited Lifetime Warranty is non-transferable