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Aprilaire 400M - Bypass Humidifier Manual

Item: 400M
MFR: 400M
This product is no longer available for purchase.
Comparable Product:


The Aprilaire Model 400 Humidifier is a whole-home solution that helps you achieve total comfort through humidity control. The Model 400 features drain-free operation, eliminating standing water. This makes it the perfect choice for homes with septic systems, locations where a floor drain is not available or homeowners interested in water conservation. It is installed by a local HVAC professional.

  • Minimal water usage
  • No drain required
  • No standing water
  • Delivers optimum levels of humidity control with the Automatic Digital Humidifier Control. You never have to monitor your settings or wait until you feel uncomfortable.
  • Provides vital service, temperature and relative humidity indicators in manual mode as well.
  • Humidifies tightly constructed homes up to 4,000 square foot in size.
  • Has an evaporation capacity of 0.70 gallons per hour.

Protect Your Family From Overly Dry Air
When you use the Aprilaire Model 400 Humidifier, you eliminate the unhealthy and damaging effects of overly dry air on your family and home. Find a dealer near you to decide if the Model 400 is right for you based on your home's size, age and construction. Or get replacement parts for your existing Model 400 here.


NameAprilaire 400M - Bypass Humidifier Manual
Gemaire Item Number400M
Manufacturer Product Number400M
SKU - PIM Number1381924785249
ERP Number333644
Unit of MeasureEACH
Weight9.4 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