The SPDT contact action of the Model W43A-14 Humidistat provides control of humidifying or dehumidifying equipment. A flush-mounting bracket that fits a standard outlet box is supplied. The Model W43A features field-adjustable high and low stops. Stops can be set for locked setting. Designed for use in Building Automation Systems, BAS, and HVAC applications, the Model W43A-14 includes a faceplate for horizontal mounting. The plate is for on-the-job installation over vertical plate. It can be field converted to concealed adjustment. Specify plate kit PLT333-12R (vertical) or PLT333-9R (horizontal).