Learn to measure and interpret airflow, ventilation performance and indoor air quality in ducts, rooms and building systems. Our guides explain air velocity, volume flow, differential pressure, CO₂ concentration, thermal comfort and the conditions needed for repeatable measurements.Compare vane, hot-wire and differential-pressure methods; see how duct traverses differ from supply-diffuser measurements using capture hoods or accessories. Explore Testo airflow instruments and the roles of probe selection, measuring-point placement, area calculations and uncertainty. These guides support diagnosis and reporting; a single reading is not a complete ventilation assessment or a substitute for applicable commissioning standards.
To assess workplace thermal comfort with the testo 480 , use compatible probes to record air temperature, relative humidity, air speed and globe temperature, then select the instrument’s PMV/PPD measurement pro.
testo 405i: testo 405i is a hot-wire Smart Probe suited to low-speed air-velocity assessment and duct measurement; it is not a vane instrument. The app.
testo 410i: testo 410i uses a 30-mm vane and reads air velocity and temperature; the companion app derives volume flow using entered geometry. It is.
A rising differential pressure across a filter often indicates increasing resistance to airflow, but the same reading must be interpreted alongside air.
Two CO2 meters can disagree because they sample different air, respond at different speeds, or have different calibration, sensor performance and.
CO2 can rise quickly in a meeting room when occupants generate carbon dioxide faster than outside air replaces or dilutes it. Small room volume, high.