Tier1 Humidifier Water Panel 10 Filter for Aprilaire (2pk)

Designed to Fit: Fits Aprilaire humidifiers requiring the #10 filter, models 110, 220, 500, 500A, 500M, 550, 550A, and 558 | Actual Size: 9-1/2 inches (height) x 10 inches (width) x 1-1/2 inches (depth) | High Efficiency Filtration: Reduces pollutants from the water used in your humidifier to produce better air quality | Great for home use. | Compatible Design: Comparable replacement filter that improves air quality.