Loaded with an example test so you can see how it reads. Clear starts a blank one.
1
Job
2
Cooler
Pad face area—
3
Airflow
Traverse average, not a single centreline reading — velocity peaks mid‑duct and one shot reads high. Bare duct is 100% free area; a grille or register passes about 70–80%.
Calculated CFM—
4
Readings
Inlet in the shade at the intake — not roof‑deck or attic air. Outlet in the plenum or first register, in the moving airstream.