Which of the following is true regarding a quench vent that exits a facility?

A quench vent that exits a facility should indeed have a roof guard or a deflector plate. This is essential to ensure that the vented helium gas from a quench—which can be extremely cold and potentially hazardous—does not create a dangerous situation for individuals or equipment in the vicinity. The roof guard or deflector plate helps to direct the gas and ensure it disperses safely away from the facility and any nearby areas, minimizing the risk of cold exposure or asphyxiation.

Having a deflector plate can also prevent inadvertent disturbances caused by wind, which might redirect the gas flow back towards open areas or entrances. This aids in creating a safer environment around the facility, aligning with safety best practices in the management of quench vents.