• Uses thermistor sensing element in ventilation duct systems.
• Negative temperature coefficient (NTC) causes resistance to decrease as sampled air temperature increases.
• Resistance change used as in input to control W973 and M7415.
• Requires no settings or calibration.
• Mounts on duct surface with four screws (not supplied).
• Approvals, Underwriters Laboratories Inc.- Component Recognized

Uses thermistor sensing element in ventilation duct systems.. 3750 Ohms Mixed Air Sensor - Duct or Discharge Air, Used with W957F Economizer