Although our return rate is low, sometimes our air purifiers do not work out for customers. You can return or exchange an air purifier or any accessory* within 90 days of purchase as part of our 90-Day Money Back Guarantee and Free Returns. Free returns are only valid for customers in the contiguous United States (excludes AK, HI, and PR). All we require is that the air purifier or accessory is returned in a 'like-new' condition, with all the parts wrapped (remote, manual, etc.) securely in the original packaging. Call us for a Return Authorization Number and a free prepaid return label. Once our team has received and inspected the returned product, we will either provide a full refund or proceed with an exchange. Items returned that are not in a 'like-new' condition may be subject to restocking fees. Please note that replacement filters are not returnable if the wrappings are removed.