NAFA CAFS SAMPLE EXAM QUESTIONS
AND ANSWERS 2026 VERIFIED.
1 millionth of a meter is called a _____? - ANS Micrometer or Micron
The air we breath is composed mainly of ______? - ANS Nitrogen
The size of particles in outdoor air are mainly _____ and smaller - ANS 1 micrometer
___________ (size) particles behave like a gas, have negligible settling rates, and are affected by
Brownian Motion. - ANS Particles less than 0.1 micrometers
Rated flow of air through a filter at specified pressure drop is called _____? - ANS Capacity
The four principles of air filtration are? - ANS 1. Impingement
2. Interception
3. Diffusion
4. Straining
If Static Pressure goes up, Velocity Pressure goes _______? - ANS Down (SP + VP = TP)
In the filter industry, a manometer is used to measure? - ANS Pressure drop across a filter
@2026/2027 ALLRIGHTS RESERVED.
, An Electronic Air Cleaner collects particles by? - ANS Electrostatically charging them and
collecting them on oppositely charged plates.
What is the formula for expressing air flow through a duct? - ANS 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. - ANS Static Pressure
Velocity Pressure must always be ______? - ANS Positive
The sum of the static pressure and velocity pressure is? - ANS Total pressure
What is the primary difference between mechanical and electrostatic filter medias? -
ANS 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? -
ANS Impingement
Which of the following products would require an ionizing section - ANS Electronic Air
Cleaner
What does CFM stand for? - ANS cubic feet per minute
What does FPM stand for? - ANS feet per minute
Which of the following would be the best description of the straining filtration principle? -
ANS
@2026/2027 ALLRIGHTS RESERVED.
AND ANSWERS 2026 VERIFIED.
1 millionth of a meter is called a _____? - ANS Micrometer or Micron
The air we breath is composed mainly of ______? - ANS Nitrogen
The size of particles in outdoor air are mainly _____ and smaller - ANS 1 micrometer
___________ (size) particles behave like a gas, have negligible settling rates, and are affected by
Brownian Motion. - ANS Particles less than 0.1 micrometers
Rated flow of air through a filter at specified pressure drop is called _____? - ANS Capacity
The four principles of air filtration are? - ANS 1. Impingement
2. Interception
3. Diffusion
4. Straining
If Static Pressure goes up, Velocity Pressure goes _______? - ANS Down (SP + VP = TP)
In the filter industry, a manometer is used to measure? - ANS Pressure drop across a filter
@2026/2027 ALLRIGHTS RESERVED.
, An Electronic Air Cleaner collects particles by? - ANS Electrostatically charging them and
collecting them on oppositely charged plates.
What is the formula for expressing air flow through a duct? - ANS 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. - ANS Static Pressure
Velocity Pressure must always be ______? - ANS Positive
The sum of the static pressure and velocity pressure is? - ANS Total pressure
What is the primary difference between mechanical and electrostatic filter medias? -
ANS 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? -
ANS Impingement
Which of the following products would require an ionizing section - ANS Electronic Air
Cleaner
What does CFM stand for? - ANS cubic feet per minute
What does FPM stand for? - ANS feet per minute
Which of the following would be the best description of the straining filtration principle? -
ANS
@2026/2027 ALLRIGHTS RESERVED.
