problem 1:

Discuss on the factors which should be taken in consideration prior to the employ of respiratory protective equipment by employees when exposed to dusts, chemicals or decreased oxygen.

problem 2:

In brief describe what is meant by the term Nominal Protection Factor.

problem 3:

If a respiratory mask with the NPF of 9 is worn by a worker in a working atmosphere holding 45 mg/m³, determine the concentration of dust in air that the worker will breathe in the mask.

problem 4:

Under OSHA 2005, the Occupational Exposure Standard for total inhalable dust is 10 mg/m³, what must be the NPF of the mask that employees must wear to meet the required standard if the workplace air contains 160 mg/m³?

problem 5:

Selection of a proper fan can be complicated and must be done by a ventilation or fan expert. Illustrate out the criteria which should be considered in selection of fans appropriate for a workplace.