NAFA Certified Air Filter Specialist
(CAFS) EXAM STUDY GUIDE 2026/2027
COMPLETE QUESTIONS WITH VERIFIED
CORRECT ANSWERS
|| 100% GUARANTEED PASS
<NEWEST VERSION>
1. What are the 3 types of media used in contaminate control - ANSWER ✔
Active carbon, chemically treated carbon, potassium permanganate
2. What is residence time? - ANSWER ✔ the time it takes air to cross a
distance equal to the thickness of the filter without accounting for the
resistance of the media through which it travels
3. What are the variations of the contamination control principle - ANSWER ✔
clean the air required by the process, blanket the product with cleaned air,
offer enough air flow to move contaminated air away from the product
4. What is removal efficiency - ANSWER ✔ The fraction of the contaminate
that once in contact with the media is removed by either physical or
chemical means
5. What is Capacity - ANSWER ✔ The amount the media is capable of
removing - this determines the life of the filter
,6. What are two types of filter options - ANSWER ✔ partial bypass, total
retention
7. What is the ASHRAE standard 62.1/62.2 - ANSWER ✔ Ventilation for
acceptable indoor air quality to specific minimum ventilation rates IAQ
which will be acceptable to humans and are intended to avoid adverse health
effects
8. How many classifications of air is there? - ANSWER ✔ 4
9. What are the IAQ testing applications - ANSWER ✔ Particulate
contaminants, Gas phase, systems integrity, comfort parameters
10.What are the four characteristics that can make an overspray filter
hazardous? - ANSWER ✔ Corrosivity, ignitability, reactivity and toxicity
11.Why is industrial finishing used? - ANSWER ✔ enhance the life of the
product, make it pretty
12.Natural ventilation procedure allows what? - ANSWER ✔ Outdoor in -
windows
13.What is PCO? - ANSWER ✔ Photocatalytic Oxidization
,14.What is ASHRAE? - ANSWER ✔ American Society of Heating,
Refrigerating and Air conditioning Engineers
15.Aerosols cover a wide range of sizes. True or false? - ANSWER ✔ True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
16.A micron is approximately ___________ of an inch. - ANSWER ✔
1/25,400".
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
17.Particle counters used to use tungsten light, and were limited to measuring
particle sizes down to 0.3 microns. Newer units, using ___________ as a
source of light, have the capability of counting particles smaller than 0.1
micron. - ANSWER ✔ Lasers.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5
18.If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream
of 2000cfm, what would your velocity(fpm) be? - ANSWER ✔ 41.66fpm.
V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.1
, 19.Electronic Air Cleaners are externally powered devices. True or false? -
ANSWER ✔ True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.3
20.The thicker the filter media and the closer the orientation of fibers, the
________ the possibility of collision by a fiber. - ANSWER ✔ Greater.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4
21.Impingement filters are frequently treated with adhesives that coat the fibers
and create a bond between the particle and the fiber. True or false? -
ANSWER ✔ True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.5
22.A dipole moment is when there is a ________ _____________ of electrons
at ____ _______ of a molecule than there is at ____________. - ANSWER
✔ Greater concentration.
One end.
Another.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
(CAFS) EXAM STUDY GUIDE 2026/2027
COMPLETE QUESTIONS WITH VERIFIED
CORRECT ANSWERS
|| 100% GUARANTEED PASS
<NEWEST VERSION>
1. What are the 3 types of media used in contaminate control - ANSWER ✔
Active carbon, chemically treated carbon, potassium permanganate
2. What is residence time? - ANSWER ✔ the time it takes air to cross a
distance equal to the thickness of the filter without accounting for the
resistance of the media through which it travels
3. What are the variations of the contamination control principle - ANSWER ✔
clean the air required by the process, blanket the product with cleaned air,
offer enough air flow to move contaminated air away from the product
4. What is removal efficiency - ANSWER ✔ The fraction of the contaminate
that once in contact with the media is removed by either physical or
chemical means
5. What is Capacity - ANSWER ✔ The amount the media is capable of
removing - this determines the life of the filter
,6. What are two types of filter options - ANSWER ✔ partial bypass, total
retention
7. What is the ASHRAE standard 62.1/62.2 - ANSWER ✔ Ventilation for
acceptable indoor air quality to specific minimum ventilation rates IAQ
which will be acceptable to humans and are intended to avoid adverse health
effects
8. How many classifications of air is there? - ANSWER ✔ 4
9. What are the IAQ testing applications - ANSWER ✔ Particulate
contaminants, Gas phase, systems integrity, comfort parameters
10.What are the four characteristics that can make an overspray filter
hazardous? - ANSWER ✔ Corrosivity, ignitability, reactivity and toxicity
11.Why is industrial finishing used? - ANSWER ✔ enhance the life of the
product, make it pretty
12.Natural ventilation procedure allows what? - ANSWER ✔ Outdoor in -
windows
13.What is PCO? - ANSWER ✔ Photocatalytic Oxidization
,14.What is ASHRAE? - ANSWER ✔ American Society of Heating,
Refrigerating and Air conditioning Engineers
15.Aerosols cover a wide range of sizes. True or false? - ANSWER ✔ True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
16.A micron is approximately ___________ of an inch. - ANSWER ✔
1/25,400".
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
17.Particle counters used to use tungsten light, and were limited to measuring
particle sizes down to 0.3 microns. Newer units, using ___________ as a
source of light, have the capability of counting particles smaller than 0.1
micron. - ANSWER ✔ Lasers.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5
18.If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream
of 2000cfm, what would your velocity(fpm) be? - ANSWER ✔ 41.66fpm.
V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.1
, 19.Electronic Air Cleaners are externally powered devices. True or false? -
ANSWER ✔ True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.3
20.The thicker the filter media and the closer the orientation of fibers, the
________ the possibility of collision by a fiber. - ANSWER ✔ Greater.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4
21.Impingement filters are frequently treated with adhesives that coat the fibers
and create a bond between the particle and the fiber. True or false? -
ANSWER ✔ True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.5
22.A dipole moment is when there is a ________ _____________ of electrons
at ____ _______ of a molecule than there is at ____________. - ANSWER
✔ Greater concentration.
One end.
Another.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
