NAFA CAFS 126 Exam Questions
What does the effectiveness of impingements filters depend on? -
Correct Answer ✔ ✔ Dust particle size, density of the dust, depth
of the filter, velocity of the airflow
Impingement filters work by? - Correct Answer ✔ ✔ larger
particles do not move around the fiber with the airstream and are
carried into the fiber due to their speed, weight and size
What are the categories of enclosed finishing booths - Correct Answer
✔ ✔ cross draft and down draft
Welding smoke is removed how? - Correct Answer ✔ ✔ Using a
source capture hood
What is face velocity? - Correct Answer ✔ ✔ the speed of the air
as it approaches the filter face
,in order to be classified a HEPA filter the efficiency must be at least? -
Correct Answer ✔ ✔ 99.97% on 0.3 microns
What is the difference between hot DOP and cold DOP - Correct
Answer ✔ ✔ Size of particle challenge
Underrating a filter may have the unintended consequence of -
Correct Answer ✔ ✔ Changing the efficiency curve
What are the four characteristics that can make an overspray filter
hazardous? - Correct Answer ✔ ✔ Corrosivity, ignitability,
reactivity and toxicity
Why is industrial finishing used? - Correct Answer ✔ ✔ enhance
the life of the product, make it pretty
Natural ventilation procedure allows what? - Correct Answer ✔ ✔
Outdoor in - windows
What is PCO? - Correct Answer ✔ ✔ Photocatalytic Oxidization
, What is ASHRAE? - Correct Answer ✔ ✔ American Society of
Heating, Refrigerating and Air conditioning Engineers
What is MERV - Correct Answer ✔ ✔ Minimum Efficiency Rating
Value
When exhaust air exceeds intake air________must be provided to
replace the difference - Correct Answer ✔ ✔ Make up air
A drawback of PCO may be the? - Correct Answer ✔ ✔ high
initial cost of equipment
what should technicians do before servicing units in which UV lights
have been installed? - Correct Answer ✔ ✔ Turn off the lights
prior to opening compartments where the lights are located
Why should UVGI lights be installed downstream of filters? - Correct
Answer ✔ ✔ UV light can destroy certain types of filter media
What does the effectiveness of impingements filters depend on? -
Correct Answer ✔ ✔ Dust particle size, density of the dust, depth
of the filter, velocity of the airflow
Impingement filters work by? - Correct Answer ✔ ✔ larger
particles do not move around the fiber with the airstream and are
carried into the fiber due to their speed, weight and size
What are the categories of enclosed finishing booths - Correct Answer
✔ ✔ cross draft and down draft
Welding smoke is removed how? - Correct Answer ✔ ✔ Using a
source capture hood
What is face velocity? - Correct Answer ✔ ✔ the speed of the air
as it approaches the filter face
,in order to be classified a HEPA filter the efficiency must be at least? -
Correct Answer ✔ ✔ 99.97% on 0.3 microns
What is the difference between hot DOP and cold DOP - Correct
Answer ✔ ✔ Size of particle challenge
Underrating a filter may have the unintended consequence of -
Correct Answer ✔ ✔ Changing the efficiency curve
What are the four characteristics that can make an overspray filter
hazardous? - Correct Answer ✔ ✔ Corrosivity, ignitability,
reactivity and toxicity
Why is industrial finishing used? - Correct Answer ✔ ✔ enhance
the life of the product, make it pretty
Natural ventilation procedure allows what? - Correct Answer ✔ ✔
Outdoor in - windows
What is PCO? - Correct Answer ✔ ✔ Photocatalytic Oxidization
, What is ASHRAE? - Correct Answer ✔ ✔ American Society of
Heating, Refrigerating and Air conditioning Engineers
What is MERV - Correct Answer ✔ ✔ Minimum Efficiency Rating
Value
When exhaust air exceeds intake air________must be provided to
replace the difference - Correct Answer ✔ ✔ Make up air
A drawback of PCO may be the? - Correct Answer ✔ ✔ high
initial cost of equipment
what should technicians do before servicing units in which UV lights
have been installed? - Correct Answer ✔ ✔ Turn off the lights
prior to opening compartments where the lights are located
Why should UVGI lights be installed downstream of filters? - Correct
Answer ✔ ✔ UV light can destroy certain types of filter media
