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Aprilaire 400MK Manual Bypass Humidifier, 0.7 gph, 24V, Up to 4000 sq-ft Coverage, 10 W x 12 3/4 H

(2 customer reviews)

$399.00 $260.00

Members Price: $247.00
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Product Description

Manual Bypass Humidifier, 15.38 in. Width, 15-3/4 in. Height, 0.7 gph Capacity, Depth: 10-1/4 in., 24V Volts, Up to 4000 sq-ft Coverage Area, 10 in. Width x 12-3/4 in. Height Plenum Opening, 6 in. Bypass Opening, 1/2 in. ID Drain Connection, 24 VAC Transformer, Manual Humidistat, Remote Temperature Sensor, Saddle Valve, Aprilaire #45 Water Panel Includes


  • Minimal water usage
  • No drain required
  • No standing water
  • Provides vital service, temperature and relative humidity indicators in manual mode as well
  • Humidifies tightly constructed homes up to 4000 sq-ft in size
  • Prevents flu and allergies
  • Neutralizes static electricity
  • Reduces pet dander and discomfort
  • Protects fine furniture and wood floors
  • Relieves dry skin and scratchy throats

Additional information




  • Width
    15.38 in.
  • Height
    15-3/4 in.
  • Bypass Opening
    6 in.
  • Capacity
    0.7 gph
  • Coverage Area
    Up to 4000 sq-ft
  • Depth
    10-1/4 in.
  • Drain Connection
    1/2 in. ID
  • Plenum Opening Size
    10 in. Width x 12-3/4 in. Height
  • Volts

2 reviews for Aprilaire 400MK Manual Bypass Humidifier, 0.7 gph, 24V, Up to 4000 sq-ft Coverage, 10 W x 12 3/4 H

  1. Amanda

    I really like this product. I was suggested this model from the Installmart guy. They also provided the best price. I can certainly say that I never feel the air quality so pure and clean since I got this unit. I will certainly recommend Installmart to my friends as their technicins are also very professional.

  2. Paul Thompson

    I was impressed by both service and honesty. As a bonus was really good value. I would definitely recommend them. Keep up the great work and Thank you!

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