Which statement correctly describes vent termination distance from a service regulator?

• A. A vent must terminate at least 10 feet away from a service regulator.
• B. A vent shall not terminate within 2 feet, 3 feet, 4 feet, or 5 feet of a service regulator.
• C. Termination distance is not regulated.
• D. Terminate within 1 foot of the regulator.

Answer: (B)

The safety concept here is that the vent from a service regulator must be kept at a defined distance away from the regulator to prevent vented gas from affecting the regulator or nearby openings. Vented gas, if discharged too close, can re-enter the regulator vent path or nearby air intakes, creating a risk of ignition or gas buildup around the regulator.

The statement that the vent shall not terminate within 2, 3, 4, or 5 feet means there is a minimum clearance that must be maintained—specifically, the vent must terminate farther than five feet from the regulator. This reflects the regulated need for a safe, adequate distance for venting.

The other options either imply a specific shorter or longer distance or suggest no regulation at all, or require the vent to terminate very close to the regulator, which contradicts the safety purpose of establishing a minimum clearance.