NAFA Certified Air Filter Specialist (CAFS) Practice Exam

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• To be classified as a HEPA filter, what minimum efficiency must it achieve?
• What types of sealants are used in HEPA filters?
• What is the primary focus of total retention filters?
• A major source of pollution in a building is?
• What is the name of the current European Air Filter Standard?
• What are the two types of cleanroom filters?
• Which condition must be met regarding electrostatic precipitator design?
• Which materials are commonly used for HEPA frames?
• A breather filter is used to protect the contents of:
• Which process is defined as the collection of gas molecules on solid surfaces?
• Which size particles behave like a gas and are affected by Brownian Motion?
• What type of air filter should be used in a clean room environment?
• What is defined as the speed of the air as it moves through the filter media?
• What is measured by a manometer in the filter industry?
• What typically happens to filter efficiency as dirt accumulates?
• What factors should be considered when selecting air filters for a hospital?
• Which factor is essential for the effectiveness of HEPA filters?
• How do temperature changes affect air filter performance?
• What are vapors in the context of air quality?
• How does high relative humidity impact the performance of certain air filters?
• What standard must baffle grease filters meet?
• For what purpose are high MERV rating filters typically used?
• Why must gas turbine supply air be free of 5 micrometer particles?
• Which of the following best defines gas?
• What is a common challenge when using high-MERV filters in residential HVAC systems?
• Which two types of gasketing are used for HEPA filters?
• What is a key component of a baghouse system?
• What is a primary function of an air filter?
• Which phenomenon explains the capture of very small particles through erratic motion?
• Which air filter type is typically made of electrostatically charged fibers?
• What types of efficiencies contribute to energy costs in air systems?
• What does VOC stand for in air quality terms?
• What is a HEPA filter's efficiency at capturing 0.3 micron particles?
• What should be provided when exhaust air exceeds intake air?
• What types of filters are used for mist and smoke removal?
• What is one advantage of using electrostatic filters?
• What type of air filter is typically used in industrial settings for heavy-duty particles?
• What generally determines the efficiency of a filter?
• Lofted glass media is most commonly found in which style of filter?
• How is the total cost of filtration determined?
• Which type of air filter is known for the best efficiency in reducing allergens?
• How does Ultraviolet Germicidal Irradiation (UVGI) function?
• In terms of filtration media, what does "depth loading" refer to?
• Which of the following describes types of metal working fluids?
• What are the different types of air cleaners?
• A particle size of 1 micrometer is equivalent to how many microns?
• What is a common filter media used in HEPA filters?
• What certification can air filters earn to signify their performance?
• What advantage do electrostatic filters have compared to traditional filters?
• What is a common feature of disposable air filters?
• In which situation is a pleated air filter preferred over a flat filter?
• What does the process of dust recovery aim to achieve?
• Which method is commonly used to measure air filter performance?
• What does the term 'air changes per hour' refer to in filtration?
• Why is it important to monitor static pressure in an HVAC system?
• What precaution should technicians take before servicing units with installed UV lights?
• What does the term 'final resistance' refer to in filter technology?
• What is defined as the pressure required to move air through a filter at a certain airflow?
• What advantage does synthetic air filter media have over fiberglass media?
• What environmental factors can affect an air filter's lifespan?
• What characterizes particulate contamination?
• Which of the following best describes chemically treated carbon media?
• Which type of charging method is NOT considered an active charged media type?
• What is the primary component of the air we breathe?
• Which of the following can hinder the process of adsorption?
• What role do HEPA filters primarily serve in air purification?
• Which characteristic is NOT used to classify microorganisms in air filtration?
• Why is it recommended to install UVGI lights downstream of filters?
• What is the primary benefit of using high-efficiency filters in residential systems?
• What must airflow through a booth achieve to control VOC vapor concentration?
• What are the two main objectives of dust separation?
• What can result from running filters to their maximum pressure drop?
• What function does the collecting section of an electrostatic precipitator serve?
• Which type of air filter is typically used in hospital environments?
• Which characteristic defines impingement filters?
• How many broad composite categories does ANSI/ASHRAE 52.2 average particles in?
• What factors influence the effectiveness of impingement filters?
• What does HEPA filter testing measure?
• What is the primary function of make up air in an HVAC system?
• Which of the following is NOT a method to control molecular contaminants?
• What are the key principles of airflow in HVAC systems?
• What testing method is used to best determine filter efficiency?
• What are the size ranges for the E1, E2, and E3 categories in ANSI/ASHRAE 52.2?
• What is 1 millionth of a meter commonly referred to as?
• What does ULPA stand for in air filtration?
• Which characteristics can make an overspray filter hazardous?
• What are the four principles of air filtration?
• Which factors significantly affect filter life?
• Metal working fluids are used to?
• What is the MERV rating of lofted microglass media that is color-coded yellow?
• What are common applications for Indoor Air Quality (IAQ) testing?
• What does MERV stand for?
• Which of the following is typically NOT a method of collecting particles in air filtration?
• What does MERV stand for in air filtration?
• What allows for retrofit without large pressure increases in the system?
• Why is it not possible to test electronic air cleaners for loading using the ASHRAE 52.2 test?
• What characterizes the optimum final pressure drop in filtration systems?
• In terms of air filtration, what does a higher face velocity typically indicate?
• What are the two main methods for molecular contaminant removal?
• How is welding smoke typically removed in industrial settings?
• How is the removal of dust performed on an electronic air cleaner?
• How does air filter media affect its filtration efficiency?
• What are the two main categories of enclosed finishing booths?
• What type of system uses UVGI lights effectively?
• How can absorption be defined in the context of air filtration?
• A two-stage air cleaner utilizes which two components?
• What is chemisorption?
• What happens to contaminant particles during the straining process?
• What is the typical efficiency rating for a MERV 8 filter?
• How often should disposable air filters generally be replaced?
• Which of the following describes the types of cleanrooms?
• What are the three types of media commonly used in contaminant control?
• What kind of particles are HEPA filters specifically designed to capture?
• How does the frequency of filter replacement influence air quality?
• Testing HEPA filters after installation is called?
• What aspect does the ANSI/ASHRAE 52.2 test specifically measure in filters?
• What is the main function of the natural ventilation procedure?
• Which type of air filter is best for individuals suffering from allergies?
• Which characteristic is NOT associated with HEPA filters?
• Which of the following describes a variation of the contamination control principle?
• What is a key benefit of using an air filter with an antimicrobial coating?
• Which feature of HEPA filters makes them highly effective?
• Which standard defines the testing method for air filter efficiency?
• Which gas is often considered a trace component in the atmosphere, making up only about 0.04%?
• What type of air filter is most commonly found in residential HVAC systems?
• What does the term "face velocity" refer to?
• What are the two types of filter options mentioned?
• What is the main drawback of using fiberglass filters?
• Even though smaller than 0.3 microns, HEPA filters can remove?
• What is the recommended level of airflow in a cleanroom environment?
• What type of filters would be most suitable for capturing smoke and VOCs?
• What type of environment benefits significantly from high-efficiency particulate filters (HEPA)?
• What does MPPS stand for in terms of airborne particles?
• Which type of filter is known for its ability to capture odors and gaseous pollutants?
• What is the purpose of a pre-filter in an HVAC system?
• How do impingement filters function?
• What are the main types of microorganisms relevant in air filtration?
• When is a dirty filter most likely to be problematic?
• What role do filtration systems play in indoor air quality control?
• Which factors affect the design and efficiency of an Electrostatic Precipitator (ESP)?
• What is the role of pre-filters in an air filtration system?
• What is the function of the initial resistance in air filters?
• How does surface area impact air filter efficiency?
• What is a crucial aspect of adherence in adsorption?
• What does a higher MERV rating indicate about an air filter?
• What are the main sections of a typical oil mist electrostatic precipitator from inlet to outlet?
• What is the primary function of ceiling diffusion media?
• How does particle size impact the choice of air filter?
• What is the significance of 'pressure drop' in relation to air filters?
• What is a common measurement unit used for assessing air particle sizes?
• How many classifications of air contaminants are recognized?
• How do mechanical filters effectively remove dust?
• What role does an air filter play in terms of energy efficiency?
• What organization is referred to by the acronym ASHRAE?
• What does UVGI stand for?
• Impingement filters primarily capture particles based on their:
• What are the strategies employed for controlling air contamination?
• Who would primarily benefit from the knowledge of overspray filter characteristics?
• What is an important consideration in the design of finishing booths?
• What term describes the rated flow of air through a filter at a specified pressure drop?
• What does the term "residence time" refer to?
• Which styles are utilized in dust separation equipment?
• What is the main function of an air filtration system?
• What type of particles are most effectively removed by HEPA filters?
• What does the acronym PCO stand for in air filtration?
• What is a consequence of not changing air filters regularly?
• Tuberculosis patients must be kept in rooms that are?
• What is one method used to maintain the efficiency of air filters?
• What is a potential drawback of PCO systems?
• What distinguishes hot DOP from cold DOP testing?
• What is the relationship between airflow rate and filter efficiency?
• What is the primary purpose of a plenum in a baghouse system?
• What are the types of HEPA separator styles?
• What is the typical size of particles found in outdoor air?
• What does ANSI/ASHRAE 52.2 - 2012 primarily measure?
• What is the main purpose of measuring pressure drop across a filter?
• How many types of reactor configurations are there in Photocatalytic Oxidation (PCO)?
• Which type of aerosol is used in the ASHRAE standard dust test?
• What is the importance of filter size in HVAC systems?
• What percentage of the total cost of a filter is attributed to energy costs?
• The air composition that makes up about 78% of the atmosphere is primarily?
• What is the minimum efficiency for a Super ULPA filter on MPPS?
• What are the three procedures for engineers outlined in the ASHRAE standard 62.1?
• What does pressure drop indicate in a filtration system?
• In what context is Brownian motion relevant?
• What is meant by "graduating density" in filter design?
• Why are some air filters labeled as "washable"?
• Which of the following factors does NOT affect mechanical filter selection?
• What happens to filtration efficiency as an air filter becomes clogged?
• What is the minimum efficiency required for ULPA filters?
• What is the primary purpose of HVAC testing?
• What are the two advantages of Minipleat filters?
• What role does airflow play in filter selection?
• What is a key reason for capturing aerosolized metal working fluids?
• What does MERV stand for in the context of air filters?
• Which factor contributes to the efficiency of a mechanical filter?
• When does interception occur in air filtration?
• What are the categories of impingement filters?
• Healthcare facilities follow filter guidelines of?
• What is the primary purpose of a filter's frame?
• Which factor does NOT determine the life of an air filter?
• What is meant by "removal efficiency"?
• Why is industrial finishing employed in manufacturing processes?
• What is the primary goal of using MERV ratings?
• What does the term "straining" refer to in HVAC systems?
• If static pressure goes up, velocity pressure goes?
• What are the two general categories of Enclosed Finish Booths?
• What is a common consequence of inadequate ventilation in offices?
• What is the name for the issue when a person comes into a building and experiences flu-like symptoms?
• What is one advantage of PCO technology in air purification?
• What is the process of gas adhering to surfaces known as?
• UVGI is most effective on microorganisms within which range of the light spectrum?
• What are the primary principles of particulate air filtration?
• What does the term "Pressure Drop" refer to in air filter performance?
• Why is static pressure an important factor in air filtration?
• What does ASHRAE standard 62.1/62.2 specify?
• How does high initial equipment cost affect the adoption of PCO technology?
• What are the main components of a HEPA filter?
• What unintended consequence can result from underrating a filter?
• What is meant by a filter's "initial efficiency"?
• A baghouse is typically composed of which components?
• Which of the following is NOT a characteristic of impingement filters?
• What is the primary function of air filters in a HVAC system?
• What is a characteristic of electronic air cleaners?
• Which of the following are types of PCO reactors?
• Why is it important to evaluate filter efficiency at different airflow rates?
• Which of the following is a common use for activated carbon filters?
• What characterizes a pocket filter?
• What is an aerosol?
• What is a primary role of an air filter technician?
• Which type of filter operates with low pressure drop and high airflow?
• What is the common dimension for HVAC air filter sizes?
• What does "dust holding capacity" indicate?
• How does filter location impact filter function in HVAC systems?
• What is the minimum efficiency required for demonstrated overspray filter performance?
• Which rating is used to quantify the efficiency of an air filter in removing aerosols?
• What common signs suggest that an air filter may need replacing?
• Bacteria reproduce by?
• What maintenance is typically required for electrostatic air filters?
• How can humidity levels influence air filter performance?
• How is "capacity" defined in the context of air filter media?
• How does the design of extended surface filters impact their performance?