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Aprilaire 400 - Bypass Style Unit

Item: 400A
MFR: 400
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Maximize your humidity control with minimal water. Choose the Model 400 with automatic digital control.
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 400 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
  • The Aprilaire Model 400 Whole-House Humidifier is the newest addition to the extensive line of Aprilaire Humidifiers and may be the perfect solution for your home. For some homes, a manual control may be recommended.
  • The Aprilaire digital control can be used in manual mode while still providing vital service, temperature and relative humidity indicators.


NameAprilaire 400 - Bypass Style Unit
Gemaire Item Number400A
Manufacturer Product Number400
SKU - PIM Number1366034437384
ERP Number227967
Unit of MeasureEACH
Weight12.0 Pound (lb.)
Length18.2 Inches (in)
Width17.2 Inches (in)
Height11.8 Inches (in)
Hazardous MaterialNo
EPA Cert RequiredNo
Country of OriginUSA
GEM - Case Quantity