NAFA CAFS Test Guide With Complete
Querstions and Answers Graded
A+|Assured Success
Why is potassium media used for carbon filters? - CORRECT ANSWER-For the removal of acid
gases, such as sulfur dioxide, hydrogen sulfide, chlorine, and hydrochloric acid
What is the standard for a baffle grease filter? - CORRECT ANSWER-96
What is a manometer used to measure? - CORRECT ANSWER-Pressure drop across the filter
, 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
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.
Querstions and Answers Graded
A+|Assured Success
Why is potassium media used for carbon filters? - CORRECT ANSWER-For the removal of acid
gases, such as sulfur dioxide, hydrogen sulfide, chlorine, and hydrochloric acid
What is the standard for a baffle grease filter? - CORRECT ANSWER-96
What is a manometer used to measure? - CORRECT ANSWER-Pressure drop across the filter
, 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
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.
