Brand New Aprilaire Whole-House Humidifier 400 MK Manual Control

The Aprilaire Model 400 MK Whole-House Humidifier features a built-in bypass damper and utilizes new evaporative technology to minimize water use. features a manual humidistat and will humidify up to 4,000 square feet. 

built-in bypass damper, which means fewer parts to install.

The newest addition to the extensive line of Aprilaire Humidifiers and may be the perfect solution for your home. 

17 Gal/Day (Waterless)

Evaporative Capacity 0.7 gph      

Unit Size 15-3/8"W x 15¾"H x 10¼"D      

Plenum Opening 9-7/8"W x 12-5/8"H      

Electrical data 24 Vac, 60 Hz, 1/2A