Question

During evaluations of the welding booths, you determine that each booth utilizes a local exhaust system to remove the iron oxide and other contaminants prior to mixing with the breathing air. You take the following measurements Location Air Velocity (fpm) Work distance from exhaust opening (in inches) Duct Diameter (in inches)Flow Rate (cfm) Booth #1 Booth #2 Booth #3 Booth #4 Booth #5 Booth #6| Unknown 683 Unknown 710 184 Unknown 18 16 16 26 8 8 12 8 8 12 Unknown 12,375 Unknown Unknown 9721 11421 18 After taking the air samples for employee exposures to iron oxide, then measuring and calculating the performance of the local exhaust ventilation (paying particular attention to the specifics), what recommendations would you make to reduce the employee's overexposure, if any, to the entilation systems?

Answer 1