Welding Hood Exhaust Requirements. Position the workpiece and LEV hood to reduce the worker being exposed to the rising fume. This system shall be of sufficient capacity and so arranged as to remove fumes and smoke at the source and keep the concentration of them in the breathing zone within safe limits as defined in Subpart D of this part.
Hoods should be placed as near as practical to the work and should provide effective air flow with a velocity of 100 linear feet 30 meters per minute at its most remote distance from the point of welding. Bureau of Mines for such purposes are provided. This hood is designed to receive the emissions of a source.
This will leave you with just a perimeter slot around the 10x10 welding area.
Local exhaust ventilation shall consist of freely movable hoods intended to be placed by the welder or burner as close as practicable to the work. Local forced air ventilation is a local air moving system. Hoods can be broken down into three basic types9. Hoods generally remove the fumes and contaminated air through ducting and exhaust the contaminants to the outdoors.