The pros and cons of local exhaust ventilation systems

What do you think are the pros and cons of local exhaust ventilation systems and general dilution ventilation systems? Provide at least one example of an occupational setting where you have seen a general dilution ventilation system effectively reduce exposures and one example of an occupational setting where you have seen a general dilution ventilation system not provide effective reduction of exposure requiring a local exhaust ventilation system to be installed.Your journal entry must be at least 200 words in length. No references or citations are necessary