- Compatible Models : Designed for use with Honeywell humidifiers in the HCM-300, HCM-500, HCM-600, HCM-700, HCM-1000, and HCM-2000 series, including models such as 300T, 530, 635, 710, and more. Check model compatibility before purchase. - Replacement Filter A : This filter is a direct replacement for part numbers HAC-504, HAC-504AW, and HAC504V1, ensuring seamless integration with your humidifier. - High-Quality Material : Crafted from professional-grade filter paper, our filter delivers exceptional performance. The innovative honeycomb pad design maximizes water absorption, ensuring optimum moisture output for your space. - Simple Installation : Changing filters is quick and easy. For best results, replace the filter every 1-2 months to maintain efficiency and air quality. - Effective Moisture Solutions : Ideal for individuals with dry air issues, those suffering from allergies, or anyone looking to enhance comfort in their home or office. Helps prevent dry skin, respiratory discomfort, and static electricity. - User-Friendly : Perfect for busy households or workplaces, this filter makes maintaining your humidifier hassle-free, ensuring fresh air is always just a switch away. Keep your indoor air healthy and comfortable with the HAC504 Humidifier Wicking Filter – the reliable choice for your Honeywell humidifier needs.