Check the listing for details. SIEMENS QPM2162 DUCT AIR QUALITY SENSOR NEW OPEN BOX. Color: Gray, Condition: New – Open box, Made in United States. Listed at 130.00 USD. The SIEMENS QPM2162 DUCT AIR QUALITY SENSOR is a reliable and efficient device designed to monitor and improve air quality in HVAC systems. With its corded electric power source and medium-density fiberboard construction, this sensor is durable and easy to install. The gray color and sleek design make it a discreet yet effective addition to any industrial or commercial setting. Made by the trusted brand Siemens, this unit is a top choice for ensuring healthy air quality in your space.The SIEMENS QPM2162 DUCT AIR QUALITY SENSOR is a reliable and efficient device designed to monitor and improve air quality in HVAC systems. With its corded electric power source and medium-density fiberboard construction, this sensor is durable and easy to install. The gray color and sleek design make it a discreet yet effective addition to any industrial or commercial setting. Made by the trusted brand Siemens, this unit is a top choice for ensuring healthy air quality in your space.