← Air purifier filters·HomeAlenAir purifier filters: models and replacement parts for this brand.Search this categoryModels (8)BreatheSmart 45iBreatheSmart 45i (Pet)BreatheSmart 75iBreatheSmart 75i (White)BreatheSmart ClassicBreatheSmart FIT50BreatheSmart FlexBreatheSmart Flex (Pet)Parts (3)ALEN-B75-MPBreatheSmart 75i medical-grade layerALEN-BF35-HEPABreatheSmart Classic HEPA-Pure filterALEN-FL40-HEPABreatheSmart 45i / Flex HEPA layer