Research Products 400m Bypass Humidifier 17 Gpd

Product Description

The RESEARCH PRODUCTS 400m is a drainless, bypass-style evaporative humidifier designed for whole-home humidity control in forced-air heating systems. Operating on 24 volts at 0.5 amps, it delivers up to 17 gallons of moisture per day using a Water Panel wicking media that draws water upward through capillary action while gravity returns it downward — cycling 100 percent of the supplied water through evaporation. Feed rate is 3 gallons per hour with an evaporation rate of 0.70 gallons per hour. The unit ships with a manual humidistat for straightforward on-site humidity setpoint control. HVAC technicians and installers are the primary trade handling this equipment.

The 400m is suited for residential forced-air systems where a supply or return duct bypass installation is practical. The drainless design eliminates the need for a floor drain connection, making it a practical choice for installations where drain access is limited or costly to add. It mounts to the supply or return plenum and relies on airflow through the bypass duct to carry evaporated moisture into the conditioned space. The included manual humidistat provides direct control without requiring a separate controller purchase.

Key Features

• Drainless evaporative design uses 100 percent of delivered water — no drain line required
• 17 gallons per day moisture output capacity for whole-home coverage
• Water Panel wicking media combines gravity flow and capillary action for consistent evaporation
• Low-voltage 24-volt, 0.5-amp operation integrates with standard furnace control circuits
• Manual humidistat included for field-set humidity control
• Feed rate of 3 gph and evaporation rate of 0.70 gph for predictable water consumption

Compatibility

Designed as an OEM-style bypass humidifier for residential forced-air heating systems with accessible supply or return plenum ductwork.

Installation Notes

Installation is performed by licensed HVAC technicians. Shut off power to the furnace and close the main water supply valve before beginning any connections. The bypass duct, water supply saddle valve, and low-voltage wiring to the furnace control board must all be completed per local mechanical codes and the manufacturer installation instructions. Do not operate the unit without confirming the Water Panel media is properly seated and the water distribution tray is unobstructed.

Technical Specifications

• Product Type: Humidifier
• Capacity: 17 gallons per day
• Voltage: 24 volts
• Amperage: 0.5 amps
• Evaporation Rate: 0.70 gallons per hour
• Feed Rate: 3 gallons per hour
• Width: 15.375 inches
• Height: 15.75 inches
• Depth: 14.25 inches

Standard Information

• Brand: RESEARCH PRODUCTS
• Manufacturer Part Number: 400m