HONEYWELL HUMIDIFIER REPLACEMENT FILTER -These replacement humidifier filters use a patented design that helps inhibit 99.9% of growth and migration of particles on the filter. A blue pre-filter layer helps capture large particles WORKS WITH - Honeywell “T” wicking filters (HFT600) include a blue prefilter that capture large particles; They work with Evaporative Honeywell Top Fill Tower humidifier models HEV615 and HEV620 COUGH AND CONGESTION RELIEF - Humidifiers for home can be helpful during cold and flu season, when it’s difficult to sleep with cough and congestion; A humidifier or vaporizer can provide temporary relief by adding necessary moisture to the air COMPATIBLE DOES NOT MEAN COMPARABLE - For best performance, use only these Genuine Honeywell humidifier filters; Compatible humidifier filter replacements are not certified to offer the same performance or efficiency A BRAND YOU CAN TRUST - Honeywell has been keeping families comfortable in their homes for over 100 years with our full line of humidifiers, filters and more