Which of the following doesn't make the best use of ventilation?

• A. Put as many fans and exhausts in a space as you can
• B. Position ventilation near the hazard
• C. Use a combination of general and local exhaust
• D. Move air toward the work area from a clean source

Answer: (A)

Controlling welding fumes relies on directing clean air to where contaminants are generated and pulling those contaminants away from the breathing zone. The best approach combines general ventilation to dilute the overall air and local exhaust to capture fumes at the source, with the air flow designed to move from a clean source toward the work area so contaminants are displaced rather than recirculated.

Putting in as many fans as possible isn’t effective because it can create unpredictable air currents, push fumes around instead of away, and may pull contaminated air back toward workers or into other spaces. It also wastes energy and can add heat and noise without reliably removing the hazards. So the option that doesn’t make the best use of ventilation is adding lots of fans without targeting airflow to capture fumes at the source and maintain clean-to-contaminated air movement.