Hunter 31920 EnduraWick Replacement Filter for 32512 Carefree Humidifier Hunter Humidifier Replacement Filter Fits Hunter 5-gallon models 32502, 32512A and 32517. Hunter anti-bacterial humidifier filter. Measures approximately 9 3/4 x 9 1/2 x 2. The #1 humidifier system preferred 10 to 1 by physicians! Protects against the growth of microorganisms!