NAFA CAFS /Exam Questions and Correct
Answers
Question 1
Why do HVAC testing
Correct Answer
Determine efficiency of the particle size removal, amount of contaminate removed,
and pressure drop
Question 2
A 2 stage air cleaner utilizes what 2 things?
Correct Answer
An Ionizer section, a collector section
Question 3
Minipleats have more media than most extended surface filters providing two
advantages - what are they
Correct Answer
lower initial pressure drop and longer life in service
Question 4
A drawback of PCO may be the?
Correct Answer
high initial cost of equipment
Question 5
The size of the particles in outdoor air are mainly what size?
Correct Answer
1 micrometer
Page 1 of 71
,Question 6
What are the IAQ testing applications
Correct Answer
Particulate contaminants, Gas phase, systems integrity, comfort parameters
Question 7
Min demonstrated overspray filter eff must be at least
Correct Answer
98%
Question 8
What are the categories of enclosed finishing booths
Correct Answer
cross draft and down draft
Question 9
What are the types of Microorganisms
Correct Answer
Virus, Bacteria, Fungi
Question 10
What does the effectiveness of impingements filters depend on?
Correct Answer
Dust particle size, density of the dust, depth of the filter, velocity of the airflow
Question 11
HEPA filter testing consists of?
Correct Answer
Penetration converted to overall efficiency including gaskets, sealing and framing,
initial resistance and 2 flow testing (leak test)
Page 2 of 71
,Question 12
What are the two general categories of Enclosed Finish Booths?
Correct Answer
cross draft and down draft
Question 13
Name the different HEPA frame material
Correct Answer
Partical board, plywood, extruded alum, formed sheet metal
Question 14
what is the function of ceiling diffusion media
Correct Answer
clean the air of particles 5 micron and larger, diffuse he air evenly across the booth
Question 15
The air we breath is composed mainly of?
Correct Answer
Nitrogen
Question 16
When exhaust air exceeds intake air________must be provided to replace the difference
Correct Answer
Make up air
Question 17
What are two types of filter options
Correct Answer
partial bypass, total retention
Page 3 of 71
, Question 18
Dust separation is used for two objectives?
Correct Answer
Recover valuable product from plant processes that generate dust 2. Clean air to
stay in compliance with OSHA and EPA requirements
Question 19
What are the styles of Dust Separation equipment
Correct Answer
cyclone, shaker, reverse pulse, jet pulse
Question 20
What is media velocity
Correct Answer
the speed of the air as it moves through the filter media
Question 21
The four principles of air filtration are?
Correct Answer
Impingement, interception, diffusion, and straining
Question 22
When does Interception occur?
Correct Answer
When a dust particle follows air streams but still comes into contact with the fiber as
it passes around it. It is fiber size dependent and is enhanced when fiber and
particles are close in size
Page 4 of 71
Answers
Question 1
Why do HVAC testing
Correct Answer
Determine efficiency of the particle size removal, amount of contaminate removed,
and pressure drop
Question 2
A 2 stage air cleaner utilizes what 2 things?
Correct Answer
An Ionizer section, a collector section
Question 3
Minipleats have more media than most extended surface filters providing two
advantages - what are they
Correct Answer
lower initial pressure drop and longer life in service
Question 4
A drawback of PCO may be the?
Correct Answer
high initial cost of equipment
Question 5
The size of the particles in outdoor air are mainly what size?
Correct Answer
1 micrometer
Page 1 of 71
,Question 6
What are the IAQ testing applications
Correct Answer
Particulate contaminants, Gas phase, systems integrity, comfort parameters
Question 7
Min demonstrated overspray filter eff must be at least
Correct Answer
98%
Question 8
What are the categories of enclosed finishing booths
Correct Answer
cross draft and down draft
Question 9
What are the types of Microorganisms
Correct Answer
Virus, Bacteria, Fungi
Question 10
What does the effectiveness of impingements filters depend on?
Correct Answer
Dust particle size, density of the dust, depth of the filter, velocity of the airflow
Question 11
HEPA filter testing consists of?
Correct Answer
Penetration converted to overall efficiency including gaskets, sealing and framing,
initial resistance and 2 flow testing (leak test)
Page 2 of 71
,Question 12
What are the two general categories of Enclosed Finish Booths?
Correct Answer
cross draft and down draft
Question 13
Name the different HEPA frame material
Correct Answer
Partical board, plywood, extruded alum, formed sheet metal
Question 14
what is the function of ceiling diffusion media
Correct Answer
clean the air of particles 5 micron and larger, diffuse he air evenly across the booth
Question 15
The air we breath is composed mainly of?
Correct Answer
Nitrogen
Question 16
When exhaust air exceeds intake air________must be provided to replace the difference
Correct Answer
Make up air
Question 17
What are two types of filter options
Correct Answer
partial bypass, total retention
Page 3 of 71
, Question 18
Dust separation is used for two objectives?
Correct Answer
Recover valuable product from plant processes that generate dust 2. Clean air to
stay in compliance with OSHA and EPA requirements
Question 19
What are the styles of Dust Separation equipment
Correct Answer
cyclone, shaker, reverse pulse, jet pulse
Question 20
What is media velocity
Correct Answer
the speed of the air as it moves through the filter media
Question 21
The four principles of air filtration are?
Correct Answer
Impingement, interception, diffusion, and straining
Question 22
When does Interception occur?
Correct Answer
When a dust particle follows air streams but still comes into contact with the fiber as
it passes around it. It is fiber size dependent and is enhanced when fiber and
particles are close in size
Page 4 of 71
