Supply/return/exhaust mixed up
Confirm the system tag before tying in. Supply, return, exhaust, and outside air ducts are not interchangeable.
Watch out
- Do not connect duct because it is nearby or the same size.
Check
- Find the tag on the drawing: SA, RA, EA, OA, MUA, or other system label.
- Trace the duct back to equipment, shaft, fan, VAV, or grille.
- Check airflow arrows and room served.
- Compare duct label/tag to the field piece or shop drawing.
- Ask before tying different systems together.
Steps
- Find the tag on the drawing: SA, RA, EA, OA, MUA, or other system label.
- Trace the duct back to equipment, shaft, fan, VAV, or grille.
- Check airflow arrows and room served.
- Compare duct label/tag to the field piece or shop drawing.
- Ask before tying different systems together.
Say this to your foreman
This run/tag is unclear at [location]. Is this supply, return, exhaust, outside air, or make-up air before I connect it?
More in Airflow, Noise, Vibration & TAB