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Drawing Duct UP/DN notation

Drawing Duct UP/DN notation

Drawing Duct UP/DN notation

(OP)
Looking for people's opinion (or a standard) on how you would note duct (or pipe) going through a floor in plan view.

Specific example:
2 story building. AHU on roof, space being served is on the first floor. The drawing I am notating is at the 2nd level, where a transition happens for 1st floor coordination, but no take off is happening at the second level (which probably doesnt matter anyways).

See attached rough sketch.
1 2 3 4
24x24 SA UP (FROM AHU-1)
12x12 SA DN (TO LAB)

20x20 RA UP (TO AHU-1)
10x10 RA DN (FROM LAB)

1 = DUCT SIZE
2 = TYPE OF AIR
3 = WHICH PLANE AT 2ND LEVEL IS BEING BROKEN
4 = DIRECTION OF AIRFLOW

I think this small detail was lost on my generation of engineer's as the importance of drafting has been pushed aside in school and our early years of our career. Any suggestions would be greatly appreciated.

knowledge is power

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