AprilAire 45 Water Panel Humidifier Filter Replacement for AprilAire Whole-House Humidifier Models 400, 400A, 400M (Pack of 2)

Price: $29.60
(as of Oct 21, 2026 14:35:36 UTC – Details)


Maintaining proper humidity levels is integral to maintaining Healthy Air. This genuine AprilAire replacement water panel humidifier filter is made with heavy-duty paper reinforced with two layers of aluminum coated to prevent the growth of biologicals. The panel absorbs water and maintains the proper level of hydration to support the evaporation process. Water is vaporized as air warmed by the furnace passes over the water panel. The humidified air is carried through the house through the air ducts. AprilAire has been there since the beginning by introducing the first whole-home humidifier in 1954. Since then, we’ve continued to focus on quality design, engineering, and manufacturing to deliver Healthy Humidity to every home. Proper humidity levels protect your home’s wood furnishings from cracking or splitting while lowering your energy bill. Keep your AprilAire Humidifier running at peak performance by replacing your water panel annually. The Model #45 Water Panel dimensions are 9-7/8″ W x 12-7/8″ H x 1.75″ D and illustrated instructions help you change your water panel quickly and efficiently.
BUY WITH CONFIDENCE This genuine replacement water panel was designed and manufactured in the USA by AprilAire – the leader in indoor air quality solutions to optimize the performance of your AprilAire Humidifier Models: 400, 400A and 400M
PERFECT APRILAIRE FIT The Model #45 Water Panel dimensions are 9-7/8″ W x 12-7/8″ H x 1.75″ D and it’s made of heavy-duty paper, reinforced with two layers of aluminum mesh and treated with an anti-microbial agent to prevent the growth of mold
FOR OPTIMAL PERFORMANCE replace your genuine AprilAire Whole-Home Humidifier Water Panel twice during the season – this convenient 2-pack offers a 1-year supply
HUMIDITY FOR HEALTH AprilAire Humidifiers can help you maintain optimal humidity in your home of 40% – 60% which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites. In addition, you’ll feel more comfortable while also preserving items in your home susceptible to damage from changing humidity or dry conditions.
EASY INSTALLATION Follow the illustrated instructions included
HEALTHY AIR APP COMPATIBLE – This AprilAire Water Panel is compatible with the AprilAire Healthy Air App! The Healthy Air App features water panel replacement reminders, plus educational content about maintaining the perfect humidity levels in your home, and information on outdoor air quality in your area.
Customers find the humidifier filter works well, fits perfectly, and offers good value as an exact replacement at half the cost. They appreciate its ease of installation, with one noting it requires no tools to change out. The accuracy of the product receives mixed feedback, with some confirming it’s an OEM unit while others suspect it’s a cheap knockoff. Durability and humidity control also get mixed reviews, with some saying it should last longer and one reporting it keeps their 5,000 sq ft house at target humidity.