Heavy-duty paper panel reinforced with two layers of aluminum for durability and consistent performance
Antimicrobial coating prevents growth of bacteria, viruses, fungi, and dust mites for cleaner air
Designed and manufactured in the USA for guaranteed compatibility and quality
Compatible with AprilAire 400, 400A, and 400M whole-house humidifier models for easy replacement
Supports optimal indoor humidity (40-60%) to reduce respiratory issues and protect home furnishings
Summarized by Shop
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 h
Panel Dimensions
9 7/8 in W x 12 7/8 in H x 1.75 in D (Model 400), 10 in H x 13 in L x 1.75 in W (Model 400A, 400M)
Material
Heavy-duty paper reinforced with two layers of aluminum
Coating
Antimicrobial agent
Pack Size
2 water panels
Compatible Models
AprilAire 400, 400A, 400M
Summarized by Shop
4.0
2 ratings
5
4
3
2
1
They need to be replaced often . Sooner than the manufacturers recommendation.
J
John · February 15, 2026
I liked the price for this multipack as opposed to single individual pricing. Also, I received my purchase in a timely manner.