Tier1 HAC-504AW Comparable Honeywell HAC-504 Replacement Wick Filter for Honeywell Models HCM-530, HCM-535-20 3 Pack DESIGNED TO FIT: Fits Honeywell humidifiers requiring HAC-504AW filter, models HCM-530, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-551, HCM-632, HCM-632TG, HCM-640BW, HCM-1000C, HCM-1010, HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050, HCM-2051, HCM-2052, HCM-300T, HCM-305T, HCM-305T-CST, HCM-300T, HCM-315T, HCM-350, HCM-350B, HCM-535, HCM-560, HCM-630, HCM-631, HCM-635, HCM-645, HCM-646, HCM-650, HCM-710, HCM-1000, HCM-2000, HEV-312, HEV-355 ACTUAL SIZE: 10-3/10 inches (height) x 8-1/2 inches (width) x 4-19/50 inches (depth) HIGH EFFICIENCY FILTRATION: Reduces pollutants from the water treated to inhibit the growth of mold, bacteria, algae, and fungus. FILTER LIFE: For optimum performance, replace every 2 months. 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Reduces static Eases cold and allergy symptoms Soothes sore throat and dry, irritated skin Creates a comfortable living environment Reduces chance of nose bleeds Alleviates snoring for better sleep