Final answer:
The MUC of a respirator combines the APF with the exposure limit to determine the level of protection. A lower MUC number is more desirable. The MUC helps in selecting an appropriate respirator for a hazardous environment.
Step-by-step explanation:
The correct statement about a respirator's maximum use concentration is that it combines the APF (Assigned Protection Factor) with the exposure limit to determine an adequate protection level. The APF is the level of protection provided by the respirator, while the exposure limit is the maximum acceptable concentration of a hazardous substance. By multiplying these two values together, the maximum use concentration (MUC) is determined, which helps in selecting an appropriate respirator for a particular environment.
For example, if the APF of a respirator is 10 and the exposure limit is 5 ppm (parts per million), the MUC would be 50 ppm (10 x 5 = 50). This means the respirator can be used in an environment where the concentration of the hazardous substance does not exceed 50 ppm to provide adequate protection.
It's important to note that a lower MUC number is more desirable than a higher one. A lower MUC indicates that the respirator can provide sufficient protection even in environments with lower concentration levels of the hazardous substance.
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