Which term refers to introducing uncontaminated air to reduce airborne concentrations?

Which term refers to introducing uncontaminated air to reduce airborne concentrations?

• A. Dilution Ventilation
• B. Inlet
• C. Natural Ventilation
• D. Friction Losses

Answer: (A)

Dilution ventilation works by introducing uncontaminated air into a space to dilute airborne contaminants. By supplying clean air and circulating it so it mixes with the contaminated air, the overall concentration decreases as the air exchange rate increases. The effectiveness depends on how much clean air is brought in relative to the amount of contaminated air and how well the space mixes the air. This approach is about reducing concentrations through mixing with fresh air, rather than capturing contaminants at the source. An inlet is merely a spot where air enters and doesn’t define the method. Natural ventilation relies on outdoor conditions and may be unpredictable, so it isn’t a controlled dilution strategy. Friction losses involve pressure drops in ducts and do not describe how contaminant concentrations are lowered.

Dilution ventilation works by introducing uncontaminated air into a space to dilute airborne contaminants. By supplying clean air and circulating it so it mixes with the contaminated air, the overall concentration decreases as the air exchange rate increases. The effectiveness depends on how much clean air is brought in relative to the amount of contaminated air and how well the space mixes the air. This approach is about reducing concentrations through mixing with fresh air, rather than capturing contaminants at the source. An inlet is merely a spot where air enters and doesn’t define the method. Natural ventilation relies on outdoor conditions and may be unpredictable, so it isn’t a controlled dilution strategy. Friction losses involve pressure drops in ducts and do not describe how contaminant concentrations are lowered.