1. Why should engineering controls, such as protective housings, interlocked enclosures, and ventilation systems, be the primary method used by companies to control exposure to laser hazards? 2....

1. Why should engineering controls, such as protective housings, interlocked enclosures, and ventilation systems, be the primary method used by companies to control exposure to laser hazards?

2. Discuss four health hazards that occur in altered environments such as clean rooms.