In the event that you do not identify the correct answer, if you show your work and how you arrived at your result, you may receive partial credit.However, if you do not show your work and the answer is not correct, zero credit will be given for that problem.If additional attachments are necessary to show your work, be sure to scan them in and attach before you click submit.

1.If the velocity in a duct is 400 fpm and the area of the duct is 3.5 square feet, what is the flow rate in the duct? (5 pts)

2.If the velocity in the duct is 1000 fpm and the duct diameter (of a round duct) is 6 inches, what is the flow rate in the duct? (5 pts)

3.Two chemicals are being considered for an open cleaning operation – acetone and isopropyl alcohol.The average barometric pressure at the facility is 720 mm Hg.(20 pts)

Given that both solvents perform the cleaning appropriately, based on the Vapor Hazard Index and using the OSHA PELs, which would you recommend?Look up the properties of each of these chemicals in the NIOSH Pocket Guide to perform this calculation.

4.In a 5,000 sq. ft office space designed for 50 employees, what is the calculated minimum required ventilation rate in cfm/person of outside air to the occupied zone? (10 pts)

5.In a 3,000 sq. ft school laboratory space designed for 20 students, what is the calculated minimum required ventilation rate in cfm/person of outside air to the occupied zone? (10 pts)

6.Describe in your own words why you think the recommendations for cfm/person are different in your answers for questions 4 and 5. (5 pts)

7.The velocity pressure of an airstream in a 6” round duct is measured using a pitot tube and manometer. If the average VP was 0.35 inches w.g., what is the average velocity in the duct? What is the volume flow rate in cfm in the duct?Assume a density correction factor of 0.95. (10 pts)

1. The design air volume flow rates at an air handling unit (AHU) are as follows:

QSA = 17,500 scfm, and QOA = 2000 cfm

What percentage of outside air would be expected from this design? If the intended number of

employees served by the AHU is 100, how much air per person will be delivered? (10 pts).

9.Describe the nine steps of risk assessment and risk management used to determining hazards and evaluate potential controls. (25 pts) (Make sure your answer is substantial enough to earn the full 25 points and you answer in your own words).

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