NAFA CAFS Test Exam Questions With Correct Answers
Latest Update 2025/GRADED A+
1. Aerosols cover a wide range of sizes. True or True.
false?
NAFA Guide to Air Filtration, 5th ed.
2014, page 1.2
2. A micron is approximately ___________ of an 1/25,400".
inch.
NAFA Guide to Air Filtration, 5th ed.
2014, page 1.2
3. Particle counters used to use tungsten light, Lasers.
and were limited to measuring particle sizes
down to 0.3 microns. Newer units, using NAFA Guide to Air Filtration, 5th ed.
___________ as a source of light, have the ca- 2014, page 1.5
pability of counting particles smaller than 0.1
micron.
4. If you have a 20x24x12 filter, with 48sq. ft. 41.66fpm.
of media, placed in an airstream of 2000cfm,
what would your velocity(fpm) be? V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.1
5. Electronic Air Cleaners are externally powered True.
devices. True or false?
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.3
6. The thicker the filter media and the closer the Greater.
orientation of fibers, the ________ the possibili-
ty of collision by a fiber. NAFA Guide to Air Filtration, 5th ed.
2014, page 2.4
, NAFA CAFS Test
7. Impingement filters are frequently treated True.
with adhesives that coat the fibers and create
a bond between the particle and the fiber. True NAFA Guide to Air Filtration, 5th ed.
or false? 2014, page 2.5
8. A dipole moment is when there is a ________ Greater concentration.
_____________ of electrons at ____ _______ of a One end.
molecule than there is at ____________. Another.
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.6
9. The strongest force occurs between parti- Approximately the same diameter.
cles and fibers that are ___________ ____ _____
________. NAFA Guide to Air Filtration, 5th ed.
2014, page 2.6
10. What is capacity? The amount of air that a filter can han-
dle. (cfm)
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.7
11. What is dust holding capacity? The amount of dust retained by a fil-
ter to its final recommended pressure
drop.
NAFA Guide to Air Filtration, 5th ed.
2014, page 17.5
12. A panel filter has a media velocity that is lower False. A panel filter has the same media
than it's face velocity. True or false? velocity as face velocity.
Latest Update 2025/GRADED A+
1. Aerosols cover a wide range of sizes. True or True.
false?
NAFA Guide to Air Filtration, 5th ed.
2014, page 1.2
2. A micron is approximately ___________ of an 1/25,400".
inch.
NAFA Guide to Air Filtration, 5th ed.
2014, page 1.2
3. Particle counters used to use tungsten light, Lasers.
and were limited to measuring particle sizes
down to 0.3 microns. Newer units, using NAFA Guide to Air Filtration, 5th ed.
___________ as a source of light, have the ca- 2014, page 1.5
pability of counting particles smaller than 0.1
micron.
4. If you have a 20x24x12 filter, with 48sq. ft. 41.66fpm.
of media, placed in an airstream of 2000cfm,
what would your velocity(fpm) be? V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.1
5. Electronic Air Cleaners are externally powered True.
devices. True or false?
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.3
6. The thicker the filter media and the closer the Greater.
orientation of fibers, the ________ the possibili-
ty of collision by a fiber. NAFA Guide to Air Filtration, 5th ed.
2014, page 2.4
, NAFA CAFS Test
7. Impingement filters are frequently treated True.
with adhesives that coat the fibers and create
a bond between the particle and the fiber. True NAFA Guide to Air Filtration, 5th ed.
or false? 2014, page 2.5
8. A dipole moment is when there is a ________ Greater concentration.
_____________ of electrons at ____ _______ of a One end.
molecule than there is at ____________. Another.
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.6
9. The strongest force occurs between parti- Approximately the same diameter.
cles and fibers that are ___________ ____ _____
________. NAFA Guide to Air Filtration, 5th ed.
2014, page 2.6
10. What is capacity? The amount of air that a filter can han-
dle. (cfm)
NAFA Guide to Air Filtration, 5th ed.
2014, page 2.7
11. What is dust holding capacity? The amount of dust retained by a fil-
ter to its final recommended pressure
drop.
NAFA Guide to Air Filtration, 5th ed.
2014, page 17.5
12. A panel filter has a media velocity that is lower False. A panel filter has the same media
than it's face velocity. True or false? velocity as face velocity.
