Compatible with for Aprilaire Models: Specifically designed for Aprilaire whole house humidifiers 400, 400A, 400M, this replacement water panel ensures perfect 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 humidifier's performance. Easy Maintenance Routine: To ensure your humidifier operates at peak efficiency, replace the for Aprilaire 45 filter every six months. Regular replacement helps maintain consistent humidity levels and extends the lifespan of your humidifier.<br><br>Colour:White Material:Wood pulp paper<br><br>Package Contents: 4 * filter<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.