Which option describes a safety-related feature in propane systems?

Which option describes a safety-related feature in propane systems?

• A. Solenoid valve on vent line
• B. Pressure regulator vent line
• C. Relief valve on storage tank
• D. Vent line must terminate outdoors

Answer: (D)

Vent lines from propane systems are required to terminate outdoors to prevent the vented gas from accumulating inside the building. Propane is heavier-than-air, so leaks can pool in low spots or enclosed spaces, posing serious fire, explosion, and asphyxiation hazards. By directing vent gas outdoors, it disperses safely in the open air, away from occupants, doors, windows, and ignition sources. Other items involve safety features that exist in propane systems, but the specific safety practice highlighted here is outdoor venting, which directly reduces the chance of indoor gas buildup.

Vent lines from propane systems are required to terminate outdoors to prevent the vented gas from accumulating inside the building. Propane is heavier-than-air, so leaks can pool in low spots or enclosed spaces, posing serious fire, explosion, and asphyxiation hazards. By directing vent gas outdoors, it disperses safely in the open air, away from occupants, doors, windows, and ignition sources.

Other items involve safety features that exist in propane systems, but the specific safety practice highlighted here is outdoor venting, which directly reduces the chance of indoor gas buildup.