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

Item # 312396602 | AprilAire Part # 45 | UPC Code 686720200458 | UNSPSC Code 40101903 | Catalog Page #675
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Product Overview

The heavy-duty paper panel is reinforced with 2 layers of aluminum and coated with an anti-microbial agent 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. Healthy Humidity reduces the incidence and risk of respiratory infections from airborne viruses. It also helps remedy your dry skin, chronic sore throat, frequent nosebleeds and static shock. Additionally, 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. Maintaining proper humidity levels is integral to maintaining Healthy Air.

  • Designed to evaporate as much water as possible throughout the humidifier to maintain proper humidity throughout the home
  • Convenient 2-pack lasts 2-years
  • Lasts up to 1-year for optimal performance
  • Proper humidity in your home has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria, viruses, fungi and dust mites
  • For Whole-House Humidifier Models 400, 400A and 400M



Appliance Category
Appliance Parts
Brand Compatibility
General Color Family
HVAC Product Type
Humidifier Accessory
Manufacturer Warranty
No Warranty
Model Compatibility
AprilAire Models: 400, 400A and 400M
Pack Size
Part Type
Product Depth (in.)
Product Height (in.)
Product Weight (lb.)
Product Width (in.)


No Warranty