What is the air vent rate for a diver at rest?

The air vent rate for a diver at rest is determined by physiological requirements for breathing. At rest, a diver's metabolic rate is relatively low, which translates into a reduced demand for oxygen and a lower rate of carbon dioxide production.

The correct answer indicates that the air vent rate is 2 ACFM (actual cubic feet per minute) under these conditions. This value represents the volume of air needed for adequate breathing to sustain a diver who is not exerting themselves, ensuring that they have enough fresh air without unnecessary wastage.

Higher values would indicate a ventilation rate suitable for more strenuous activity, which would not apply in this case as the diver is at rest. Understanding the importance of this measurement in providing safety and efficiency in diving operations underlines its significance in dive planning and execution.