Hunter 31915 PaperWick Replacement Filter for 32350, 32500, 32501, 32505, 32507 & 34500 Fits Hunter 5-gallon models 32350, 32500, 32501, 32505, 32507, 34500 and 34997. Measures approximately 8 x 9 1/2 x 1 3/4 in. Protects against the growth of microorganisms! The #1 humidifier system preferred 10 to 1 by physicians!