Locations where flammable anesthetics are employed are Class I, Division I locations that shall extend ___.

• A. Upward to the structural ceiling
• B. Upward to a level 8 feet above the operating table
• C. Upward to a level 5 feet above the floor
• D. 10 feet in all directions from the source

Answer: (C)

In rooms where flammable anesthetics are used, the area that is considered hazardous is defined by how far the danger extends upward from the floor. This is about Class I, Division 1 locations, where the presence of flammable gases or vapors requires equipment and wiring to be protected accordingly. The convention for these anesthesia areas is that the hazardous portion extends up to a height of five feet above the floor. That means any equipment within that five‑foot vertical band must meet Division 1 protection requirements.

So the correct choice is the five‑foot height because it sets the official vertical boundary for the hazardous zone in these anesthesia locations. The other options would either overstate the area (up to the ceiling, or ten feet in all directions) or specify a different height (eight feet) that isn’t the standard boundary for this scenario.