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

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! 

If you have any questions regarding this product please feel free to email support@DiscountFurnaceFilter.com or call 1-888-623-4678 and one of our knowledgeable Customer Experience Representatives will be happy to help.