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Original Question

Please help me calculate this scenario using formula’s Q= G/C for dilution ventilation and Q = AV for capture velocity: An employee working in a room measuring 15 ft x 20 ft x 15 ft sprays paint assembly parts using paint containing hexane. The PEL for hexane is 500 ppm. The employee wears a half-faced, air-purifying respirator, but management would like to install engineering control measures to reduce or eliminate the employee’s exposure to hexane. The options are to: (1) install a dilution ventilation system, or (2) install a local exhaust ventilation system. The employee works a 9-hour shift and has the following exposures: Sample No. Concentration Sampling Time 1 550ppm 1.5 hours 2 400ppm 5.8 hours 3 375ppm 1.7 hours For the general dilution ventilation system to work, there must be at least 20 room air changes per hour. The fan which supplies air to this area produces 1,500 cubic feet per minute (cfm) (Q). For the local exhaust ventilation system to remove the contaminant to acceptable concentrations, the capture velocity must be at least 140 feet per minute (fpm). The proposed local exhaust system ventilation system uses a 1.0 feet diameter duct and a fan that provides a total volume of 1,275 cubic feet per minute (cfm). The source of the contamination is located 1.5 feet from the opening of the duct. Determine the appropriate ventilation control and calculate the capture velocity.

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