Aprilaire Bypass Humidifier With Manual Control

Dry indoor air during the winter months—and year-round—can wreak havoc on your comfort level and even trigger costly damage to your home’s interior. Take back your comfort and protect the investment you made in your home when you use the Model 400 or Model 400M Whole House Humidifier! This bypass in-duct humidifier works with your existing heating, ventilation, and cooling system (HVAC) and ductwork to deliver comfortably humidified air throughout every room of your home. It uses an efficient evaporative humidifying process to raise your home’s relative humidity, adding 17 gallons of moisture per day. That’s enough to treat tightly sealed homes up to 4,000 square feet, average sealed homes up to 2,000 square feet, and loosely sealed homes around 1,000 square feet.