Replacement humidifier filter compatible with Lennox models WB217 and WP218 Key benefits Restores humidifier performance by providing a properly sized replacement filter for models WB217 and WP218. Durable construction resists breakage and fading for reliable use and longer service life. Simple to install and remove, making routine maintenance quick and straightforward. Product details Dimensions 10 1/8 inches x 12 7/8 inches x 1 1/2 inches Fits Lennox models WB217 and WP218 Aftermarket replacement part sold as a single filter per package Material designed for dependable daily operation and consistent fit How this filter helps Maintains unit function by trapping mineral buildup and preventing premature wear on internal components Keeps humidifier operation consistent between filter changes, reducing the need for frequent troubleshooting Provides an easy, cost effective way to a unit to normal operation without replacing the entire humidifier Use scenarios Seasonal maintenance replacement before the heating season to ensure dependable humidification Replacing a worn or damaged filter found during routine cleaning and inspection Restoring performance on a used or stored humidifier that has been out of service Additional information This is an aftermarket replacement part compatible with the listed models Includes one filter per package Includes 30 day money back and 18 month worry If you are unsure about fit, verify your humidifier model and serial number before ordering