A branch tap is laid out off and the duct runs crooked
Do not rack the joints or dog-leg the duct to hide the layout miss. Measure the offset, confirm the target point, and decide whether the correction is a new tap, patch/remake, or approved offset fitting.
Do not twist the branch, rack S-and-drive/TDC joints, or leave a crooked run because the first layout mark was wrong.
Check
Mark the current tap centerline and the correct target centerline.
Measure offset left/right, up/down, and the available straight length for a correction.
Check if the tap hole is already cut, sealed, insulated, or easy to correct now.
Confirm whether the branch serves a diffuser, wall sleeve, VAV, or equipment connection.
Check whether an offset fitting would create access, ceiling, or airflow trouble downstream.
Steps
Mark the current tap centerline and the correct target centerline.
Measure offset left/right, up/down, and the available straight length for a correction.
Check if the tap hole is already cut, sealed, insulated, or easy to correct now.
Confirm whether the branch serves a diffuser, wall sleeve, VAV, or equipment connection.
Check whether an offset fitting would create access, ceiling, or airflow trouble downstream.
Say this to your foreman
The branch tap on [main/location] is off by about [amount] from the target. I measured the offset and the run length. Do you want me to correct the tap, patch/remake the section, or build an approved offset fitting?