The AprilAire 300 Self-Contained Whole House Humidifier was designed and manufactured in the U.S.A. by AprilAire – the inventor of the whole home evaporative humidifier, and the leader in indoor air quality solutions. This self-contained, whole-home, fan-powered evaporative humidifier is perfect for homes heated with boilers, mini-splits, radiant heat, and other ductless systems. It can be installed in any home with any heating system, including homes with ducted forced air furnace systems. The Model 300 humidifier features a compact design (12-1/2"W x 14-3/8"H x 22-3/32"D), 30% more capacity*, Quiet Fan Technology, and Water Panel access at the bottom of the unit for quick humidifier filter replacement. The AprilAire 300 Humidifier provides whole-home coverage of up to 3,900 sq ft** in tightly built homes and can deliver up to 13 gallons of moisture to the air per day and can is easily installed in any utility closet, laundry room, or basement with reliable access to hot water. Please reference installation instructions included with every AprilAire Humidifier before installing. *When compared to AprilAire Model 350 **Based on AHRI Guideline F Humidifier Sizing