NAFA CAFS EXAM QUESTIONS AND CORRECT ANSWERS.

NAFA CAFS EXAM QUESTIONS AND
CORRECT ANSWERS
Question 1
ASHRAE recommends that orthopedic operating rooms, bone marrow transplant
rooms, and organ transplant rooms have 3 banks of filters for air entering the room.
What are the MERV ratings of those 3 banks?
Correct Answer
First bank: MERV 8
Second bank: MERV 14
Third bank: Terminal HEPA

NAFA Guide to Air Filtration, 5th ed. 2014, page 10.7



Question 2
ASHRAE Synthetic Test Dust is composed of what 3 things?

Correct Answer
Standardized Air Cleaner Test Dust (aka, road dust) predominantly silica, powdered
carbon, and cotton linters.



Question 3
A micron is approximately ___________ of an inch.
Correct Answer
1/25,400".

NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2




Page 1 of 71

,Question 4
The most popular material used for corrugated separators in a HEPA filter is
_____________.

a.) Kraft paper
b.) Aluminum
c.) Stainless steel
d.) Polyvinyl chloride

Correct Answer
b.) Aluminum

NAFA Guide to Air Filtration, 5th ed. 2014, page 5.3



Question 5
A panel filter has a media velocity that is lower than it's face velocity. True or false?
Correct Answer
False. A panel filter has the same media velocity as face velocity.

NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1



Question 6
The American Institute of Architects(AIA) states that the minimum filter efficiency for
recirculation of air within individual isolation rooms be _________________.
Correct Answer
99.97% DOP (HEPA)

NAFA Guide to Air Filtration, 5th ed. 2014, page 10.6



Question 7
ANSI/ASHRAE Standard 62.1-2013 Section 5.9 states that schools shall have a filter
efficiency of at least MERV __.
Correct Answer
8

NAFA Guide to Air Filtration, 5th ed. 2014, page 12.8




Page 2 of 71

,Question 8
In paint booths for luxury or quality merchandise, the make-up air must contain no
particles 5 micron and larger, because:

a.) This is the size particle must inhaled by the operator
b.) This size particle is not captured by the exhaust filters
c.) This size particle can cause the paint finish to "fish-eye"
Correct Answer
c.) c.) This size particle can cause the paint finish to "fish-eye"

Note: The book does not use the term "fish-eye", but this is is how it was described
on the test.

NAFA Guide to Air Filtration, 5th ed. 2014, page 16.3



Question 9
An agglomerator must always be used with after filters. True or false?
Correct Answer
True.

NAFA Guide to Air Filtration, 5th ed. 2014, page 6.5



Question 10
All biological safety cabinets require periodic certification and filter change. True or
false?
Correct Answer
True.

NAFA Guide to Air Filtration, 5th ed. 2014, page 10.10




Page 3 of 71

, Question 11
Metal working fluids (MWF) are used to:

a.) Reduce the temperature of the cutting tools
b.) Reduce the temperature of the production part
c.) Clean the production part
d.) All of the above
Correct Answer
d.) All of the above.

MWF are used to cool, lubricate, and clean the produced part and the tools.

NAFA Guide to Air Filtration, 5th ed. 2014, page 15.1



Question 12
The strongest force occurs between particles and fibers that are ___________ ____ _____
________.
Correct Answer
Approximately the same diameter.

NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6



Question 13
Aerosols cover a wide range of sizes. True or false?
Correct Answer
True.

NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2



Question 14
What is dust holding capacity?
Correct Answer
The amount of dust retained by a filter to its final recommended pressure drop.

NAFA Guide to Air Filtration, 5th ed. 2014, page 17.5




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