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The Williamson Power 400-13 R is the correct compatible replacement filter for the following humidifier models:
The Williamson Power 400-13 Humidifier Filter Pad is a replacement humidifier wick filter for the Williamson Power furnace humidifier models 400 and 500. This evaporator pad measures approximately 9-7/8"x11-3/4"x1-3/8" and features unique honeycomb filtration that effectively traps mineral pollutants within water to provide you with clean, moist air.