Which gas source is appropriate for ventilating a confined space?

Which gas source is appropriate for ventilating a confined space?

• A. Only oxygen
• B. Only nitrogen
• C. Only air
• D. Only hydrogen

Answer: (C)

Ventilation in a confined space should restore a breathable atmosphere by bringing in fresh air and diluting contaminants. Using air as the ventilation source is appropriate because it provides the necessary oxygen without introducing hazardous conditions. Pure oxygen would raise the risk of fire or explosion in spaces that may contain flammable materials. Nitrogen would displace oxygen and create an asphyxiation hazard. Hydrogen is highly flammable and adds explosion risk, while it does not improve the breathable air. Air from outside delivers a normal, breathable mix of gases, helping maintain safe oxygen levels and dilute contaminants.

Ventilation in a confined space should restore a breathable atmosphere by bringing in fresh air and diluting contaminants. Using air as the ventilation source is appropriate because it provides the necessary oxygen without introducing hazardous conditions. Pure oxygen would raise the risk of fire or explosion in spaces that may contain flammable materials. Nitrogen would displace oxygen and create an asphyxiation hazard. Hydrogen is highly flammable and adds explosion risk, while it does not improve the breathable air. Air from outside delivers a normal, breathable mix of gases, helping maintain safe oxygen levels and dilute contaminants.