Hunter Humidifier Replacement Filter Fits Hunter furnace humidifier models 33201, 33202, and 33222. * Hunter humidifier wick filters (evaporator pads). * Measures approximately 4 5/8" x 6 1/8" x 1 5/8". * Honeycomb filtration to trap mineral pollutants found in water and help prevent them from entering your home. * For optimum performance, replace filter once every 6 months or more often in hard water areas.