- COMPATIBLE MODELS: Our humidifier filters are specifically designed for use with a variety of Honeywell models including HAC-504, HAC-504AW, HAC-504V1, HCM-350, HCM350, HCM350W, HCM-350B, HCM-350B-CST, HCM-300, HCM-300T, HCM305T, HCM-305T, HCM310T, HCM-315T, HCM305BCST, HCM-450B-CST, HCM450BCST, HCM-500, HCM-530, HCM530, HCM-535, HCM353, HCM-535-20, HCM53520, HCM-540, HCM550, HCM-550-19, HCM55019, HCM-551, HCM-560, HCM560, HCM-600, HCM-630, HCM630, HCM-631, and HCM631 humidifiers. - HIGH-QUALITY MATERIAL: Our replacement filters are constructed from durable, rigid reinforced mesh paper. Designed with hot glue strips and a dense structure, these filters maintain their integrity when wet, reducing sagging and ensuring superior performance. - OPTIMIZED PERFORMANCE: Experience improved air quality during the winter months. Our humidifier filters help alleviate discomfort from dry air by effectively filtering impurities in the water. This prevents white dust from dispersing into your environment, ensuring cleaner air and optimal humidifier efficiency. - COST-EFFECTIVE PACKAGE: Each purchase includes four Standard White Humidifier Filter Replacements for Honeywell HAC-504. Filter dimensions are 7.0 inches high, 5.3 inches long, and 4.8 inches wide. - USAGE TIPS: For best results, fill your humidifier tank with distilled water. Use of hard water can degrade filter quality, causing yellowing and reduced effectiveness over time. - PRACTICAL APPLICATIONS: - Ideal for households in dry winter climates, providing relief from dry skin and respiratory discomfort. - Perfect for use in bedrooms, nurseries, or offices to maintain optimal humidity levels and improve overall comfort. - Essential for allergy sufferers, as it helps to filter out airborne impurities and enhance indoor air quality.