General Filters mhx3c Duct Mount Analog Humidistat

Product Description

The General Filters mhx3c is a manual analog humidistat designed for duct-mount installation in forced-air HVAC systems. It senses relative humidity levels within the supply or return air duct and sends a signal to the connected humidifier or dehumidification equipment to cycle on or off as needed. Compatible with both 115-volt and 24-volt control circuits, this humidistat offers flexible wiring options for a wide range of residential and light-commercial applications. HVAC technicians install this control as part of whole-home humidity management setups, typically paired with bypass, drum, or fan-powered humidifiers.

The mhx3c is suited for duct-mount installations in residential and light-commercial forced-air systems where manual humidity setpoint adjustment is preferred over digital or programmable controls. It fits standard duct penetration installations and is appropriate for new construction and retrofit applications alike. Installers working on whole-home humidification systems will find this control straightforward to wire into existing low-voltage or line-voltage humidifier circuits.

Key Features

• Manual analog setpoint adjustment for straightforward humidity control without programming
• Dual-voltage compatibility at 115 volts and 24 volts for flexible system integration
• Duct-mount design positions the sensor directly in the airstream for accurate humidity sensing
• Suitable for both residential and light-commercial HVAC applications

Compatibility

Designed as an OEM-style replacement or new-installation duct-mount humidistat for residential and light-commercial forced-air humidification systems.

Installation Notes

Installation should be performed by a licensed HVAC technician. Shut off power to the air handler and humidifier circuit at the breaker before beginning any wiring work. Mount the humidistat in the supply or return duct per the manufacturer instructions, ensuring the sensor probe extends fully into the airstream. Follow all applicable NEC and local electrical code requirements when connecting line-voltage or low-voltage wiring.

Technical Specifications

• Voltage: 115/24 volts
• Control Type: Manual analog
• Mount Type: Duct mount

Standard Information

• Brand: General Filters
• Manufacturer Part Number: mhx3c