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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