1|Page
NAFA Certified Air Filter Specialist (CAFS) VERIFIED
EXAM TEST BANK ALL 250 QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR||NEWEST EXAM!!!!
In the filter industry, a manometer is used to measure? -
Answer-Pressure drop across a filter
An Electronic Air Cleaner collects particles by? - Answer-
Electrostatically charging them and collecting them on
oppositely charged plates.
What is the formula for expressing air flow through a duct?
- Answer-Q=A*V
Quantity = Area of the Duct * Velocity of Air
_____________ is the pressure within the duct that is
capable of bursting the duct and may be positive or
negative. - Answer-Static Pressure
Velocity Pressure must always be ______? - Answer-
Positive
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The sum of the static pressure and velocity pressure is? -
Answer-Total pressure
What is the primary difference between mechanical and
electrostatic filter medias? - Answer-Mechanical media
does not rely on electrostatic charge for efficiencies.
Which of the four filter principles is the main source of
filtration in low MERV filters? - Answer-Impingement
Which of the following products would require an ionizing
section - Answer-Electronic Air Cleaner
What does CFM stand for? - Answer-cubic feet per minute
What does FPM stand for? - Answer-feet per minute
Static pressure is measured in which direction? - Answer-
All directions
Air flows because the fan creates what? - Answer-It
creates a positive pressure to the duct system
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What happens to our pressure if we enlarge a portion of
the duct work to twice the size? - Answer-Static Pressure
goes up
Velocity Pressure goes down
Total Pressure remains the same
When a filter loads static pressure goes _____, and the
velocity pressure goes ______. - Answer-up; down
Adhesives add what to a filter? - Answer-They give a force
to better hold capture particles.
Brownian motion is best descried as - Answer-Particles
bounce into one another as they flow through an air
stream.
Impingement filters are characterized by _________ and
____________. - Answer-Relatively high velocities, low
pressure drop
1 millionth of a meter is called a _____? - Answer-
Micrometer or Micron
, 4|Page
The air we breath is composed mainly of ______? -
Answer-Nitrogen
The size of particles in outdoor air are mainly _____ and
smaller - Answer-1 micrometer
___________ (size) particles behave like a gas, have
negligible settling rates, and are affected by Brownian
Motion. - Answer-Particles less than 0.1 micrometers
Rated flow of air through a filter at specified pressure drop
is called _____? - Answer-Capacity
The four principles of air filtration are? - Answer-1.
Impingement
2. Interception
3. Diffusion
4. Straining
If Static Pressure goes up, Velocity Pressure goes
_______? - Answer-Down (SP + VP = TP)
NAFA Certified Air Filter Specialist (CAFS) VERIFIED
EXAM TEST BANK ALL 250 QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR||NEWEST EXAM!!!!
In the filter industry, a manometer is used to measure? -
Answer-Pressure drop across a filter
An Electronic Air Cleaner collects particles by? - Answer-
Electrostatically charging them and collecting them on
oppositely charged plates.
What is the formula for expressing air flow through a duct?
- Answer-Q=A*V
Quantity = Area of the Duct * Velocity of Air
_____________ is the pressure within the duct that is
capable of bursting the duct and may be positive or
negative. - Answer-Static Pressure
Velocity Pressure must always be ______? - Answer-
Positive
,2|Page
The sum of the static pressure and velocity pressure is? -
Answer-Total pressure
What is the primary difference between mechanical and
electrostatic filter medias? - Answer-Mechanical media
does not rely on electrostatic charge for efficiencies.
Which of the four filter principles is the main source of
filtration in low MERV filters? - Answer-Impingement
Which of the following products would require an ionizing
section - Answer-Electronic Air Cleaner
What does CFM stand for? - Answer-cubic feet per minute
What does FPM stand for? - Answer-feet per minute
Static pressure is measured in which direction? - Answer-
All directions
Air flows because the fan creates what? - Answer-It
creates a positive pressure to the duct system
,3|Page
What happens to our pressure if we enlarge a portion of
the duct work to twice the size? - Answer-Static Pressure
goes up
Velocity Pressure goes down
Total Pressure remains the same
When a filter loads static pressure goes _____, and the
velocity pressure goes ______. - Answer-up; down
Adhesives add what to a filter? - Answer-They give a force
to better hold capture particles.
Brownian motion is best descried as - Answer-Particles
bounce into one another as they flow through an air
stream.
Impingement filters are characterized by _________ and
____________. - Answer-Relatively high velocities, low
pressure drop
1 millionth of a meter is called a _____? - Answer-
Micrometer or Micron
, 4|Page
The air we breath is composed mainly of ______? -
Answer-Nitrogen
The size of particles in outdoor air are mainly _____ and
smaller - Answer-1 micrometer
___________ (size) particles behave like a gas, have
negligible settling rates, and are affected by Brownian
Motion. - Answer-Particles less than 0.1 micrometers
Rated flow of air through a filter at specified pressure drop
is called _____? - Answer-Capacity
The four principles of air filtration are? - Answer-1.
Impingement
2. Interception
3. Diffusion
4. Straining
If Static Pressure goes up, Velocity Pressure goes
_______? - Answer-Down (SP + VP = TP)
