What is the symbol for a drop (duct going down) versus a rise (duct going up)?

Duct Drop: Typically noted on the floor plan with a square box containing a diagonal 'X' pattern or a solid shaded black pattern accompanied by the abbreviation DN (Down). Duct Rise: Typically noted with an open square box containing a central target dot or a single clean slash line accompanied by the abbreviation UP .

[" Duct Drop: Typically noted on the floor plan with a square box containing a diagonal 'X' pattern or a solid shaded black pattern accompanied by the abbreviation DN (Down). Duct Rise: Typically noted with an open square box containing a central target dot or a single clean slash line accompanied by the abbreviation UP ."]

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• Duct Drop: Typically noted on the floor plan with a square box containing a diagonal 'X' pattern or a solid shaded black pattern accompanied by the abbreviation DN (Down). Duct Rise:...

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