Aprilaire Whole-House Humidifier with Manual Control

AprilAire 700M – High-Capacity Whole-House Fan-Powered Humidifier

The AprilAire 700M is a duct-mounted, fan-powered whole-house humidifier engineered to deliver consistent humidity control in residential HVAC systems. Capable of adding up to 18 gallons of moisture per day, this model is well-suited for larger homes and demanding environments. It integrates directly into the return or supply ductwork and includes a built-in fan that draws heated air across the water panel for enhanced evaporation and system efficiency.

System Highlights

• Output Capacity: Up to 18 GPD (gallons per day) under optimum conditions
• Control: Manual humidistat included (model 4655)
• Integrated Fan: Increases evaporation rate by pulling warm air directly from the furnace
• Plenum-Mounted: Designed for installation on the warm air supply duct
• Bypass-Free Design: Self-contained airflow system eliminates the need for bypass ducting

Technical Specifications

• Model Number: 700M
• Power Requirements: 120V, 0.8 AMP
• Dimensions (HxWxD): 18 in x 15.9 in x 10.3 in
• Water Panel: Model No. 35 (replace annually)
• Coverage Area: Suitable for homes up to approximately 4,200 sq. ft. (depending on tightness and climate)

Installation Guidance

Installation requires integration into the existing HVAC duct system and a reliable water supply line. Electrical connection to the HVAC blower circuit is necessary for proper operation. Professional installation is recommended due to the electrical and plumbing components involved, along with local code compliance.

Contractor Use Notes

The AprilAire 700M is built for performance in variable-speed or multi-stage systems, though it operates as a manual unit. It features a dependable fan motor and simplified mounting design for quicker installs. Ideal for retrofit applications where bypass ducting is not feasible.