A water level can be used to maintain elevations while running ductwork.

• A. Not applicable
• B. It cannot be used
• C. Yes
• D. Not sure

Answer: (C)

A water level works here because keeping ductwork at a constant elevation across long runs is essential for proper alignment. The principle is simple: a connected column of water seeks the same height in every part of the system. By establishing a reference height at one end and using the water level to transfer that height to the next point along the run, you can set each hanger or support to match the same elevation. This allows the duct to stay level as you progress, which helps with alignment and any drainage considerations along the run. To use it, fill the tube with water, remove any air bubbles, and position one end at the known reference height; adjust the supports until the water surface at the new point lines up with the reference. Recheck at multiple points to ensure consistency. Because this method reliably transfers elevations over distance and around obstacles, the correct choice is that a water level can be used.