NAFA CAFS TEST EXAM FULLY SOLVED &
UPDATED (LATEST VERSION VERIFIED FOR
ACCURACY) LATEST!
mist and smoke removal is done with what type of filters - <<<<ANSWERS>>>media,
centrifugal, electrostatic
What are the Merv rating/color coded of lofted microglass media -
<<<<ANSWERS>>>yellow=14, Pink=13, orange=11, tan 50=9
what is the function of ceiling diffusion media - <<<<ANSWERS>>>clean the air of
particles 5 micron and larger, diffuse he air evenly across the booth
Why do HVAC testing - <<<<ANSWERS>>>Determine efficiency of the particle size
removal, amount of contaminate removed, and pressure drop
What is the ANSI/ASHRAE 52.2 - 2012? - <<<<ANSWERS>>>A design qualification
test, destructive test to measure merv, the test aerosol is Potassium Chloride .3 to 10
micron, dust loading aerosol to final pressure drop is the Ashrae standard dust test
What is initial resistance - <<<<ANSWERS>>>Pressure required to move air through
the filter at a certain air flow it written in inches, water or pascals
HEPA filter testing consists of? - <<<<ANSWERS>>>Penetration converted to overall
efficiency including gaskets, sealing and framing, initial resistance and 2 flow testing
(leak test)
What are the three ways to control molecular contaminants? -
<<<<ANSWERS>>>Source control, ventilation/dilution, removal control
What is straining? - <<<<ANSWERS>>>occurs when the smallest dimension of dust
particle is greater than the distance between adjoining media fibers
What 3 factors affect mechanical filter selection? - <<<<ANSWERS>>>efficiency,
pressure drop, capacity
, What are the active charged media types? - <<<<ANSWERS>>>Triboelectric charging,
corona charging, charging by induction
Categories of impingement filters - <<<<ANSWERS>>>panel, washable, roll, and lint
filters
Having larger fibers on the air entering side and smaller fibers on the air exit side is
called? - <<<<ANSWERS>>>Graduating density
Baffle grease filters must meet the requirements of NFPA standard -
<<<<ANSWERS>>>96
Two main methods for molecular contaminant removal are? -
<<<<ANSWERS>>>Absorption and Chemisorption
Particles bypass cells allow for retrofit without? - <<<<ANSWERS>>>large pressure
increases in the system
Name the three procedures for engineers to use in ASHRAE standard 62.1 -
<<<<ANSWERS>>>Ventilation rate, indoor air quality, natural ventilation procedure
Impingement filters are characterized by? - <<<<ANSWERS>>>Relatively high
velocities and low pressure drop
The four principles of air filtration are? - <<<<ANSWERS>>>Impingement, interception,
diffusion, and straining
The velocity of the air through any one square foot of media in an extended surface filter
is called? - <<<<ANSWERS>>>Media velocity
What percent of the total cost of a filter is energy cost? - <<<<ANSWERS>>>81%
UVGI is most effective on micro organism in what range of the light spectrum -
<<<<ANSWERS>>>200 to 280 nanometers
What are vapors? - <<<<ANSWERS>>>Gases formed by evaporation of materials that
are normally a liquid or solid
UPDATED (LATEST VERSION VERIFIED FOR
ACCURACY) LATEST!
mist and smoke removal is done with what type of filters - <<<<ANSWERS>>>media,
centrifugal, electrostatic
What are the Merv rating/color coded of lofted microglass media -
<<<<ANSWERS>>>yellow=14, Pink=13, orange=11, tan 50=9
what is the function of ceiling diffusion media - <<<<ANSWERS>>>clean the air of
particles 5 micron and larger, diffuse he air evenly across the booth
Why do HVAC testing - <<<<ANSWERS>>>Determine efficiency of the particle size
removal, amount of contaminate removed, and pressure drop
What is the ANSI/ASHRAE 52.2 - 2012? - <<<<ANSWERS>>>A design qualification
test, destructive test to measure merv, the test aerosol is Potassium Chloride .3 to 10
micron, dust loading aerosol to final pressure drop is the Ashrae standard dust test
What is initial resistance - <<<<ANSWERS>>>Pressure required to move air through
the filter at a certain air flow it written in inches, water or pascals
HEPA filter testing consists of? - <<<<ANSWERS>>>Penetration converted to overall
efficiency including gaskets, sealing and framing, initial resistance and 2 flow testing
(leak test)
What are the three ways to control molecular contaminants? -
<<<<ANSWERS>>>Source control, ventilation/dilution, removal control
What is straining? - <<<<ANSWERS>>>occurs when the smallest dimension of dust
particle is greater than the distance between adjoining media fibers
What 3 factors affect mechanical filter selection? - <<<<ANSWERS>>>efficiency,
pressure drop, capacity
, What are the active charged media types? - <<<<ANSWERS>>>Triboelectric charging,
corona charging, charging by induction
Categories of impingement filters - <<<<ANSWERS>>>panel, washable, roll, and lint
filters
Having larger fibers on the air entering side and smaller fibers on the air exit side is
called? - <<<<ANSWERS>>>Graduating density
Baffle grease filters must meet the requirements of NFPA standard -
<<<<ANSWERS>>>96
Two main methods for molecular contaminant removal are? -
<<<<ANSWERS>>>Absorption and Chemisorption
Particles bypass cells allow for retrofit without? - <<<<ANSWERS>>>large pressure
increases in the system
Name the three procedures for engineers to use in ASHRAE standard 62.1 -
<<<<ANSWERS>>>Ventilation rate, indoor air quality, natural ventilation procedure
Impingement filters are characterized by? - <<<<ANSWERS>>>Relatively high
velocities and low pressure drop
The four principles of air filtration are? - <<<<ANSWERS>>>Impingement, interception,
diffusion, and straining
The velocity of the air through any one square foot of media in an extended surface filter
is called? - <<<<ANSWERS>>>Media velocity
What percent of the total cost of a filter is energy cost? - <<<<ANSWERS>>>81%
UVGI is most effective on micro organism in what range of the light spectrum -
<<<<ANSWERS>>>200 to 280 nanometers
What are vapors? - <<<<ANSWERS>>>Gases formed by evaporation of materials that
are normally a liquid or solid
