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During further evaluations of the welding booths, you determine that each booth utilizes a local exhaust system to remove the iron oxide and other...
During further 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 #1 683 18 8 Unknown Booth #2 Unknown 16 8 12,375 Booth #3 710 16 12 Unknown Booth #4 184 26 8 Unknown Booth #5 Unknown 22 8 9721 Booth #6 Unknown 18 12 11421
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 ventilation systems?
