Fangrui Product Details Fangrui Product Details Compatible With For Aprilaire Models: Specifically Designed For Aprilaire Whole House Humidifiers 400, 400a, 400m, This Water Panel Ensures Fit And Function, Maintaining Optimal Humidity Levels In Your Home. Enhanced Moisture Distribution: Featuring A High-output Honeycomb Design, This Filter Efficiently Distributes Moisture Evenly Throughout Your Home, Maximizing The Performance Of Your Humidifier And Enhancing Indoor Air Quality. Superior Filtration Efficiency: Crafted To Reduce Pollutants In The Water, This Filter Promotes Healthier, More Breathable Air. Its Specialized Design Offers High Efficiency, Making It An Essential Part Of Maintaining Your Humidifiers Performance. Easy Maintenance Routine: To Ensure Your Humidifier Operates At Peak Efficiency, The For Aprilaire 45 Filter Every Six Months. Regular Helps Maintain Consistent Humidity Levels And Extends The Lifespan Of Your Humidifier. Colour:white Material:wood Pulp Paper Package Contents: 4 * Filter Onl