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AprilAire 45 Replacement Water Panel Humidifier Filter For 400, 400A, and 400M

SKU: 45


  • BUY WITH CONFIDENCE This genuine replacement water panel / humidifier filter was designed and manufactured in the USA by AprilAire – the leader in indoor air quality solutions, to optimize the performance of your AprilAire whole-house humidifier
  • PERFECT APRILAIRE FIT genuine AprilAire designed for peak performance of your whole-house humidifier
  • 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.


This genuine AprilAire replacement water panel is the backbone of your AprilAire humidifier. 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.


  • Compatible Models: 400, 400A, 400M, 400KZ, 400MKZ
  • Recommended Replacement Schedule: Twice per heating season
  • Materials: Paper – Wicking, Aluminum
  • Nominal Measurements: 13H x 10W x 2D (inches)
  • Actual Measurements: 12.875H x 9.875W x 1.75D (inches)

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