NAFA CAFS TEST EXAM QUESTIONS WITH 100% CORRECT ANSWERS | LATEST VERSION 2025/2026.

NAFA CAFS TEST EXAM QUESTIONS
WITH 100% CORRECT ANSWERS |
LATEST VERSION 2025/2026.




Aerosols cover a wide range of sizes. True or false? - ANS True.


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



A micron is approximately ___________ of an inch. - ANS 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. - ANS Lasers.


NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5


If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream of 2000cfm, what
would your velocity(fpm) be? - ANS 41.66fpm.



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, 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? - ANS 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. - ANS Greater.


NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4


Impingement filters are frequently treated with adhesives that coat the fibers and create a
bond between the particle and the fiber. True or false? - ANS 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 ____________. - ANS 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 ___________ ____ _____
________. - ANS Approximately the same diameter.




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