Air Spacesaver CB43 Humidifier Wick Filter, 800 Series features a patented reinforced design that longer life and greater efficiency d to standard expanded wicking filters. This high-quality filter effectively traps impurities in the water and is treated with an anti-microbial solution to ensure cleaner, healthier air. It is compatible with the Spacesaver 800 series humidifiers and measures 10.8 inches by 4.2 inches by 12.5 inches, making it an i part to maintain optimal humidifier performance. Model Number: CB43