The Tier1 Humidifier Filter Replacement for Water Panel #45 Aprilaire is the heart of your humidifier, designed specifically to deliver the proper humidity to your home during the heating season. The Tier1 Humidifier filter fits the Aprilaire models 400, 400A, and 400M. This product reduces pollutants from the water used by your humidifier, producing better indoor air quality. Replace annually for best results.
Fits Aprilaire humidifier models 400, 400A, 400M
9-8/9 inches (height) x 12-8/9 inches (width) x 1-3/4 inches (depth)
Reduces pollutants from the water used in your humidifier to produce better air quality, keeping your filter free from contaminants means the reduction of stale, unpleasant odors, and helps extend the life of the filter
Reduces the harsh effects of dry air which cause nose bleeds, dry and irritated skin, static build up, and much more.
Comparable replacement filter that improves air quality.