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4.2 OAMT Performance

The designs of commercially available outdoor airflow measurement technologies (OAMT) are highly variable. Most OAMTs are marketed as products that the user adds to their existing HVAC but some are provided only as an add-on component of a packaged unit. 
Some OAMTs consist of electronic velocity probes with multiple sensors that are installed, as specified by the manufacturer, downstream of an outdoor air intake louver or inside an outdoor air intake hood. One OAMT consists of an outdoor air intake louver with integrated air velocity probes installed at the outlet of louver blades. 

Other OAMT measures the pressure drop as air flows through a louver. One OAMT uses air speed probes installed on the outdoor air damper and tracks the damper position.