Measuring from an unverified existing duct

Do not trust existing duct as a control point until it is verified. Existing work can be wrong, moved, or scheduled for demo.

Stop if

• Is this existing duct a verified control/tie-in, or should I measure from grid?

Watch out

• Do not copy existing duct location just because it is already there.

Check

• Check whether existing duct remains or is demo.
• Measure from grid/control if possible.
• Compare existing location with current drawings.
• Verify tie-in point.
• Ask before matching existing work.

Steps

• Check whether existing duct remains or is demo.
• Measure from grid/control if possible.
• Compare existing location with current drawings.
• Verify tie-in point.
• Ask before matching existing work.

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