Aprilaire 400M Drainless Bypass Humidifier (Manual Control)

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The Aprilaire 400M bypass humidifier can humidify a tightly-constructed home of up to 4,000 square feet. The Aprilaire 400M Humidifier features a unique water-conserving design that does not require a drain line.

Type: Drainless Bypass
Evaporative Capacity: 17 gal/day
Humidistat: Manual

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Add the Aprilaire 400 Humidifier Annual Maintenance Kit to your order! This convenient kit gives you all the parts you need to maintain your Aprilaire 400M humidifier each year and keep it running in like-new factory condition.

The Aprilaire 400M Humidifier includes a built-in bypass damper that is conveniently labeled for winter and summer settings.

The Aprilaire 400M comes complete with the Aprilaire non-digital humidity control, one Aprilaire water panel, saddle valve, 24V transformer, and installation instructions from Aprilaire!