HUMIDIFIER REPLACEMENT FILTER: Filter A works with evaporative Honeywell humidifiers in the HCM-350, HEV355, HCM-710 & HCM-315/HEV312 model series. Captures minerals in the water in your humidifier & helps reduce white dust..HONEYWELL FILTERS: Honeywell replacement wicking filters use a patented design that helps inhibit 1.99% of growth & migration of particles on the filter. A blue pre-filter layer helps capture large particles..HONEYWELL HUMIDIFIERS: Humidity levels in your home between 40-60% can make the air feel warmer & improve your breathing comfort, sleeping, nasal congestion & dry skin. Dry air can cause static electricity, damage wooden furniture & irritate issues.HUMIDIFIERS FOR BABIES, , ADULTS: Humidifiers diffuse moisture into the air, and many find that a humidifier for the home, bedroom or nursery becomes an essential part of a good night's sleep when the air is dry or when sick.HONEYWELL : Improve your air & neutralize odors for a clean & y breathing experience year round with Honeywell replacement filters for air cleaners, purifiers & humidifiers.