Drawing Duct UP/DN notation 1

[cdxx139]

I feel like this is a silly question, but want to get people's opinion on how you would note duct (or pipe) going through a floor. I will provide a scenerio, and I would appreciate if you respond how you would note it on a drawing.

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

 

[MintJulep]

Well, certainly a duct shouldn't change from "Up" to "Down" in the middle of a run just because there is a size transition.

To me all of this:

24x24 SA UP (FROM AHU-1)
12x12 SA DN (TO LAB)

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

is redundant. The sketch without that text is clear and unambiguous. All that adding it does is confuse things.

 

[EnergyProfessional]

are you asking on how you show that on the floor/ceiling plan, or for this section view?

 

[cdxx139]

Excellent point, and my aplogioes for not being clearer, but the sketch was provided in section for clarity, how do you suggest noting the ducts when shown in plan at the 2nd level?



knowledge is power

 

[cdxx139]

My logic for using "up" and "down" is to explain whoich plane of the 2nd floor is being broken, so they understand whioch duct size breaks the cieling pland and which duct breaks the floor plane.



knowledge is power

 

[EnergyProfessional]

you can use one of these arbitrary standards of how to make a symbol. unless your client has a preference, you can set your own standard as long as you are consistent and make it logical.

If you use Revit, use the standard symbols, most people will be familiar with what they mean.

 

[cdxx139]

Thnak you, we use the same symbols, but you still need to relay the duct size going through the ceiling and the ductsize through the floor on the 2nd floor plan drawing for the contractor.

knowledge is power

 

[cdxx139]

Im going to copy to Drafting Standards as well.

knowledge is power

 

[iken]

Hi,

It all depends on the layout level you are drawing.

For a layout plan I would detail the following
Plan Level Drawn size SA Drawn Size RA Notes SA Note RA
Roof 24 x 24 20 x 20 24 x 24 TB 20 x 20 FB
2nd Floor 24 x 24 20 x 20 24 x 24 FA / 12 x 12 TB 10 x 10 FB / 20 x 20 TA
1st Floor 12 x 12 10 x 10 12 x 12 FA 10 x 10 TA

So from above, you detail/note the duct sizes as they pass through the floor / roof slabs of each level and detail these (it doesn't matter where the duct transition occurs, as this will be detailed on riser drawings. You Draw the duct sizes as they pass through the slab "above" your general duct layout.

Note TB - To Below
FB - To Below
FA - From Above
TA = To Above

 

[cry22]

24x24 UP (TO AHU-1)

we use these specifics only when there is multiple systems feeding the building for ease of following the duct to it's system on roof and no need to say (TO or FROM) - as for going DN, if it goes to a system (SAY RF-1) then I'd specify, if it only goes to the floor below, no need to say anything, DN is sufficient.