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Compare to Aprilaire Part # 45.
Compatible with furnace humidifier models 400, 400A, and 400M.
Filters minerals and pollutants from water before they are fed into the air, and helps control dust/dirt buildup inside humidifier.
For optimum performance replace twice a year at the start and end of the heating season.
Approx dimensions: 12.9 x 10.2 x 7.7 inches - By LifeSupplyUSA.