Question

proper ventilation is required when welding, so that you do not
overheat
cause an area to smell like smoke
burn yourself
breathe in dangerous fumes
3 of 5

Explanation:

Welding can produce dangerous fumes. Proper ventilation is to avoid inhaling them. Overheating, smoke - smell, and burns are not the main reasons related to ventilation in this context.

Answer:

Breathe in dangerous fumes