To prevent fume hazards, there must be at least _____ cubic feet of air for each welder.

The correct answer indicates that there must be at least 10,000 cubic feet of air for each welder to prevent fume hazards. This requirement is based on safety regulations and standards established to maintain a safe working environment for welders. The reasoning behind this guideline is that welding processes can produce hazardous fumes that can be detrimental to health if inhaled. Ensuring an adequate volume of air allows for greater dispersion and dilution of these fumes, reducing the risk of exposure to harmful levels.

Welders work in environments where controlled ventilation is crucial to mitigate the accumulation of harmful airborne substances. When there is sufficient airflow, it helps to maintain a safer atmosphere, thereby minimizing health risks like respiratory issues or long-term effects from fume exposure. This standard aligns with occupational safety and health requirements aimed at promoting the well-being of workers in welding operations.