NAFA CAFS Test Exam fully solved &
updated Questions and Answers 2026
Aerosols cover a wide range of sizes. True or false? - Correct answer-True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - Correct answer-1/25,400".
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
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. - Correct answer-
Lasers.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream of
2000cfm, what would your velocity(fpm) be? - Correct answer-41.66fpm.
V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.1
Electronic Air Cleaners are externally powered devices. True or false? - Correct
answer-True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.3
The thicker the filter media and the closer the orientation of fibers, the ________
the possibility of collision by a fiber. - Correct answer-Greater.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, Impingement filters are frequently treated with adhesives that coat the fibers and
create a bond between the particle and the fiber. True or false? - Correct answer-
True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.5
A dipole moment is when there is a ________ _____________ of electrons at ____
_______ of a molecule than there is at ____________. - Correct answer-Greater
concentration.
One end.
Another.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
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
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
updated Questions and Answers 2026
Aerosols cover a wide range of sizes. True or false? - Correct answer-True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - Correct answer-1/25,400".
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
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. - Correct answer-
Lasers.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream of
2000cfm, what would your velocity(fpm) be? - Correct answer-41.66fpm.
V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.1
Electronic Air Cleaners are externally powered devices. True or false? - Correct
answer-True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.3
The thicker the filter media and the closer the orientation of fibers, the ________
the possibility of collision by a fiber. - Correct answer-Greater.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, Impingement filters are frequently treated with adhesives that coat the fibers and
create a bond between the particle and the fiber. True or false? - Correct answer-
True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.5
A dipole moment is when there is a ________ _____________ of electrons at ____
_______ of a molecule than there is at ____________. - Correct answer-Greater
concentration.
One end.
Another.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
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
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
