Compatible Model: Our PM1005 replacement filter is perfectly compatible with Kenmore 850e series PM1005 air purifi-er, compare to part # KF170.Please check your unit's model number before placing an order 3 Stages of Filtration:Equiped with a high effiency 3-stage filtration system, the PM1005 air purifi-er can efficiently absorb most of airborne particles from your honme or office such as pet dand-er ,lint and hair.Cleaning the pre-filter with a vacuu-m clean-er will help to extend the life of the premium filter.Note:please take off the plastic bag before replacing the filter High Effiency Filter:Being superior than normal filter ,our PM1005 premium replacement filter helps to absorb fine particles from the air in a short time Activated Carbon Filter:The 850e series PM1005 activated carbon filter helps to absorb household odors, such as pet odor,cooking odor,smoke and VOCs Warm Tip: We recommend to replace the KF170 replacement fIlter every 6-12 months depending on using frequency Filter