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Background 3 On March 24, 2018, Be Safe Consulting, Inc. entered a contract to perform the following services: a) Conduct sampling and analysis for employee exposure to hexane, a chemical used in painting processes. b) Employees currently wear a half-face, air-purifying respirator but determine the best ventilation system needed. c) Determine the room air changes in the 4,500 cubic feet of the employee’s work room. Methodology First, the correct PEL for the 9 hour shift needed to be determined. Then to find the number of air changes in an hour, the equation Nchanges=60Q/Vi was used. The methods used to determine the best fit for ventilation system were the capture velocity equation, the air change equation, and the TWA equation. Findings The findings showed that in the 9 hour shift of the employee working with Hexane, the PEL was actually calculated to be 444.44 PEL per shift. The TWA showed to be over the limit at 456.3 ppm putting the employee potentially in harms way. In the proposed exhaust ventilation system, the capture velocity would need to be at least 140 feet per minute. The calculations showed that with the parameters listed the capture velocity would only reach 97.77 fpm, making it ineffective. However, ventilation option one, a dilution ventilation system with a fan that produces 1,500 cubic feet per minute would indeed produce the necessary 20 room air changes per hour
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