Aprilaire 400A Whole House Humidifier
Item # 400
MSRP: $259.95
Availability: In Stock!

The Aprilaire Model 400 Whole-House Humidifier features a built-in bypass damper and utilizes new evaporative technology to minimize water use. Gravity pulls water down, while the wicking action of the Water Panel draws it back to the top, using 100% of the water delivered to the unit. The Aprilaire Model H400 Whole-House Humidifier:


  • Features truly automatic control
  • Eliminates standing water, making it the perfect choice for homes with septic systems, locations where a floor drain is not available or families interested in water conservation
  • Has an evaporation capacity of 0.70 gallons per hour
  • Humidifies tightly-constructed homes up to a 4,000 square foot in size.
This Product fits the following Models:
Aprilaire: 400.
MPN: 400

Unit Dimensions: 15-29/32(W) x 15-31/32(H) x 10-11/32(D)

Plenum opening: 9-3/4(W) x 12-1/2(H)

Additional Specifications:

The following files are associated with this product:

Aprilaire 400 Installation Guide
Aprilaire 400A User Manual
Aprilaire Humidifiers Comparison

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