Honeywell HAC504 Humidifier Wick Filter, 7 in. is a high-quality humidifier filter treated with Protec antimicrobial technology to ensure a cleaner and healthier environment. Designed with an optimized filter structure, it maximizes moisture output while effectively capturing minerals and pollutants from the water. This helps prevent the formation of white dust commonly associated with humidifiers. The antimicrobial treatment works to inhibit the growth and migration of mold, algae, and bacteria on the filter, promoting better air quality. Measuring 5 inches in height and 7 inches in diameter, this filter is for tower and small tabletop humidifier models. Model Number: HAC504