Classify the different types of respirators that can be used to control exposure to harmful agents in the workplace and explain the situations in which will be appropriate?

There are two main types of respirators that can be used to control exposure to harmful agents in the workplace: air-purifying respirators and supplied-air respirators.

1. Air-purifying respirators: These respirators use filters or cartridges to remove contaminants from the air before it is inhaled. They are appropriate for situations where the concentration of harmful agents in the air is relatively low and the oxygen levels are sufficient. Air-purifying respirators are commonly used in industries such as construction, agriculture, and manufacturing.

2. Supplied-air respirators: These respirators provide clean, breathable air from an external source, such as a compressed air tank or a remote air source. They are appropriate for situations where the concentration of harmful agents in the air is high or where oxygen levels are low. Supplied-air respirators are commonly used in industries such as mining, firefighting, and hazardous waste cleanup.

The choice of respirator will depend on the specific hazards present in the workplace and the level of protection required. Employers should conduct a thorough assessment of the workplace environment to determine the appropriate type of respirator to use. It is also important to ensure that respirators are properly fitted, maintained, and used according to manufacturer instructions to provide effective protection against harmful agents.