Pollution Fighter AIR DEFENSE Clean Pollution Fighter Industrial Air Cleaners & Accessories are products of Northern Air Corp. Lifetime Warranty AN AIR CLEANER GUARANTEED TO WORK Your Pollution Fighter Air Cleaner has a limited warranty to be free from defects in  workmanship or materials for the lifetime of the product except, however, for the  disposable media which will have to be replaced from time to time depending upon the  use.  If this Northern Air unit becomes inoperable within the first 12 months for any  reason other than unusual or abusive use or handling, Northern Air will repair or  replace this unit at no cost to such purchaser.  Thereafter, Northern Air Corporation's  exclusive obligation under this warranty for the life of the product shall be to supply,  without charge, a replacement for any part of the air cleaner which is found to be  defective and is returned by either you or your original supplier to Northern Air Corp.,  450 Richmond St., Raynham, MA  02767, together with the date of installation of the air  cleaner. THIS WARRANTY SHALL NOT OBLIGATE NORTHERN AIR CORP. FOR  ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP  OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRACTED TO  DEFECTS DISCOVERED IN THE AIR CLEANER ITSELF. NORTHERN AIR  CORPORATION'S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL  DAMAGES RESULTING FROM ANY BREACH OF IMPLIED WARRANTY OF  MERCHANTABILITY OR WARRANTY OF FITNESS FOR PURPOSE OR OF THE  ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. Some states do not  allow limitations on how long an implied warranty lasts or the exclusion of limitation of  incidental or consequential damages so the above exclusion or limitations may not apply  to you.  This warranty gives you specific legal rights and you may also have other rights,  which vary, from state to state.