An employee working in a room measuring 15 ft x 20 ft x 15 ft sprays paint assembly parts using a paint containing hexane. The PEL for hexane is 500 ppm. The employee wears a half-face, 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