Reading A Duct Size Callout

Is 24x12 width-first here, and which way is airflow?

I'm checking reading a duct size callout at [location]. I found Building it rotated (12x24) so it doesn't fit the space. Is 24x12 width-first here, and which way is airflow?

Rectangular Duct & Fittings 1st Year BLUE

Stop if

Hold point on reading a duct size callout: I have the location, photo, drawing/detail/spec section, and what I checked. Who should verify before this gets cut, drilled, covered, supported, labeled, connected, or signed off?

Watch out

Assume the bigger number is always horizontal

Check

room/grid/area
photo of condition
drawing/detail/spec/submittal
what I already checked
what is blocking progress

Say this to your foreman

14538 reading a duct size callout rectangular duct blue 1 is 24x12 width-first here, and which way is airflow? i'm checking reading a duct size callout at [location]. i found building it rotated (12x24) so it doesn't fit the space. is 24x12 width-first here, and which way is airflow? duct size duct size callout, width x height, wxh