"This Hamilton Home Products evaporator pad is designed to work specifically with the HHP Whole House Humidifier Item# 172914. Compatible With HHP house humidifier, Product Type Evaporator pads, Includes qty. 1 Evaporator pad, Dimensions L x W x H in. 2 x 10 x 10. Pad enclosed in plastic frame that ensures water flows through proper path for evaporation Pads should be changed once per heating season, or more often in hard water areas"
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