Instructor Answer Key — Unlock After Review

1. Use line types/tags to follow supply/return/vent/gas.

2. Verify models/flows/rough-ins, ADA, carriers.

3. Stacks/vents/elevations in risers; cross-check plan.

4. Code slopes; watch elevation loss/conflicts.

5. BFP at service; PRVs by pressure; WH by demand.

6. Sizing by DFU/flows; cleanouts at intervals.

7. Drain + overflow; sleeves/locations with S/A.

8. Total BTU, pressure drop, regulator venting.

9. Count fixtures; measure systems; include hangers/insulation.

10. Missing elevations, unclear vents, shaft conflicts.