Which statement correctly describes General or dilution ventilation?

Which statement correctly describes General or dilution ventilation?

• A. Catch air at the source and remove it
• B. Using PPE
• C. Substitution
• D. General or dilution ventilation dilutes the atmosphere to a safe level by supplying or exhausting air

Answer: (D)

General or dilution ventilation works by diluting contaminants in the air to keep concentrations at safe levels through supplying outdoor air and exhausting indoor air. This approach lowers exposure by mixing the indoor air with cleaner air rather than capturing the pollutant at its source. That’s why the statement that describes it—diluting the atmosphere to a safe level by supplying or exhausting air—is the best fit. Catching air at the source and removing it describes local exhaust ventilation, which targets contaminants right where they’re generated. Using PPE provides protection but isn’t a ventilation method. Substitution involves replacing a hazardous substance with a less hazardous one and also isn’t about ventilation.

General or dilution ventilation works by diluting contaminants in the air to keep concentrations at safe levels through supplying outdoor air and exhausting indoor air. This approach lowers exposure by mixing the indoor air with cleaner air rather than capturing the pollutant at its source. That’s why the statement that describes it—diluting the atmosphere to a safe level by supplying or exhausting air—is the best fit.

Catching air at the source and removing it describes local exhaust ventilation, which targets contaminants right where they’re generated. Using PPE provides protection but isn’t a ventilation method. Substitution involves replacing a hazardous substance with a less hazardous one and also isn’t about ventilation.