NAFA CAFS Test Exam fully solved & updated 2026(latest version
verified for accuracy) QESTIONS WITH WELL VERIFIED ANSWERS
Aerosols cover a wide range of sizes. True or false? - answer☑️✔️.True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - 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. - answer☑️✔️.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? - 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? - 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. - answer☑️✔️.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? - 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 ____________. - 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 ___________ ____ _____
________. - answer☑️✔️.Approximately the same diameter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
What is capacity? - answer☑️✔️.The amount of air that a filter can handle. (cfm)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.7
, What is dust holding capacity? - answer☑️✔️.The amount of dust retained by a filter to its
final recommended pressure drop.
NAFA Guide to Air Filtration, 5th ed. 2014, page 17.5
A panel filter has a media velocity that is lower than it's face velocity. True or false? -
answer☑️✔️.False. A panel filter has the same media velocity as face velocity.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1
Airborne particles are attracted to fibers that have a charge opposite of their own. This
attraction is diminished when the air is _______, and as particles build up on the fibers. -
answer☑️✔️.Humid.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.3
Lofted microglass media(glass mat) is manufactured by spraying the fibers onto a _______
_________, and collected on a conveyor in the form of a mat.
They require backing material to provide physical support. Backing can not be applied at the
time the mat is formed. True or false? - answer☑️✔️.Colored binder.
False. Backing material can be applied at the time the mat is formed of the mat and backer can
be combined just before the incorporation into a filter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 4.2
verified for accuracy) QESTIONS WITH WELL VERIFIED ANSWERS
Aerosols cover a wide range of sizes. True or false? - answer☑️✔️.True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - 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. - answer☑️✔️.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? - 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? - 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. - answer☑️✔️.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? - 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 ____________. - 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 ___________ ____ _____
________. - answer☑️✔️.Approximately the same diameter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
What is capacity? - answer☑️✔️.The amount of air that a filter can handle. (cfm)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.7
, What is dust holding capacity? - answer☑️✔️.The amount of dust retained by a filter to its
final recommended pressure drop.
NAFA Guide to Air Filtration, 5th ed. 2014, page 17.5
A panel filter has a media velocity that is lower than it's face velocity. True or false? -
answer☑️✔️.False. A panel filter has the same media velocity as face velocity.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1
Airborne particles are attracted to fibers that have a charge opposite of their own. This
attraction is diminished when the air is _______, and as particles build up on the fibers. -
answer☑️✔️.Humid.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.3
Lofted microglass media(glass mat) is manufactured by spraying the fibers onto a _______
_________, and collected on a conveyor in the form of a mat.
They require backing material to provide physical support. Backing can not be applied at the
time the mat is formed. True or false? - answer☑️✔️.Colored binder.
False. Backing material can be applied at the time the mat is formed of the mat and backer can
be combined just before the incorporation into a filter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 4.2
