Homedics AR-OTFL Replacement Hepa Air Filter Replacement Hepa Filter Fits AR-15, AR-25, AR-35 & AR-45 Lasts For 18 Months Includes 2 Filters Replacement Hepa Filter Replacement Hepa Filter Fits AR-15, AR-25, AR-35 and AR-45 Lasts For 18 Months Includes 2 Filters Fits AR-15, AR-25, AR-35 and AR-45