Air quality and flow
There are many different possible solutions for measuring air quality and flow. You can see both on-wall and duct sensors here.
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Multi-functional duct sensors for measuring CO2 content and air quality (VOC).
Maintenance free sensors for measuring CO2 content and air quality (VOC) with calibratable active and switching output.
Used for monitoring gaseous, non-aggressive connections in ventilation systems, air intakes etc. Also applicable as flow control or air flow monitor.