View Full NADCA ASCS Exam Dumps and Practice Test Dumps.

Question 121. What does AFD mean in HVAC cleaning

1. Air Flow Damper
2. Air Filtration Device
3. Air Fan Drive
4. Automatic Filter Duct

Correct Answer: 2. Air Filtration Device

Explanation:

AFD stands for Air Filtration Device. NADCA includes this acronym in the current ASCS Candidate Guide because air filtration devices are commonly used during HVAC cleaning and restoration activities. These devices can help reduce airborne particles in the work environment when equipped with suitable filtration and operated correctly. They support containment and indoor environmental control but do not replace source removal from contaminated HVAC components. An ASCS technician should understand common industry acronyms because they can appear in technical documents, safety plans, project specifications, and the certification examination.

Question 122. What does IEP mean in NADCA terminology

1. Indoor Equipment Plan
2. Internal Exhaust Pressure
3. Inspection Evaluation Procedure
4. Indoor Environmental Professional

Correct Answer: 4. Indoor Environmental Professional

Explanation:

IEP stands for Indoor Environmental Professional. An IEP may be involved when specialized environmental assessment, contamination evaluation, or health related interpretation is needed beyond the ordinary scope of an HVAC cleaning technician. NADCA includes the IEP acronym in its ASCS Candidate Guide because ASCS professionals must recognize situations where another qualified specialist should become involved. Examples can include suspected microbial contamination, unusual environmental conditions, or complex exposure concerns. Knowing professional boundaries is important because an ASCS technician should not make unsupported environmental or medical conclusions outside the technician’s qualifications.

Question 123. What does MUA stand for

1. Make Up Air
2. Mechanical Utility Access
3. Mixed Unit Airflow
4. Main Utility Assembly

Correct Answer: 1. Make Up Air

Explanation:

MUA stands for Make Up Air. Make up air is introduced into a building to replace air removed by exhaust systems and help maintain appropriate pressure relationships. It is common in commercial kitchens, industrial spaces, laboratories, and other areas with significant exhaust airflow. An ASCS technician should understand the purpose of make up air equipment because these systems can contain filters, coils, dampers, fans, and ductwork that may require inspection or cleaning. NADCA lists MUA among the industry acronyms candidates should know for the ASCS examination.

Question 124. What does FPM measure in HVAC work

1. Filter loading
2. Fan pressure
3. Air velocity
4. Motor temperature

Correct Answer: 3. Air velocity

Explanation:

FPM means Feet Per Minute and is commonly used to express air velocity within ductwork, at grilles, or across HVAC components. Velocity information can help professionals understand how quickly air is moving through a system. An ASCS technician is not necessarily performing complete airflow balancing, but basic mechanical knowledge is part of the certification. Understanding common units such as FPM helps technicians interpret system information, communicate with HVAC professionals, and recognize how duct size, restrictions, and fan operation can influence airflow conditions during inspection and cleaning work.

Question 125. What does IWC commonly describe

1. Pressure measured in inches of water column
2. Duct temperature
3. Relative humidity
4. Fan speed

Correct Answer: 4. Pressure measured in inches of water column

Explanation:

IWC means Inches of Water Column, a unit commonly used to express relatively small pressure differences in HVAC systems. Static pressure, filter resistance, and negative pressure conditions can be described using inches of water column. Pressure measurements are relevant to ASCS work because maintaining proper negative pressure during cleaning helps control contaminants. NADCA includes both IWC and WC in its current acronym list so candidates recognize these common pressure terms. Understanding the unit also helps technicians interpret measurements from instruments such as manometers and communicate accurately with HVAC professionals.

Question 126. What does VOC mean

1. Variable Output Coil
2. Volatile Organic Compounds
3. Vacuum Operating Capacity
4. Ventilation Outlet Control

Correct Answer: 2. Volatile Organic Compounds

Explanation:

VOC stands for Volatile Organic Compounds. These are carbon based chemicals that can evaporate into the air and may originate from paints, cleaning products, coatings, furnishings, building materials, or other sources. Some chemical products used around HVAC systems can also emit VOCs. ASCS technicians should recognize this term because chemical applications, indoor air quality, exposure concerns, and worker safety can intersect during cleaning and restoration projects. NADCA includes VOC in the ASCS Candidate Guide acronym list and recommends studying chemical application guidance as part of exam preparation.

Question 127. What does SDS provide

1. HVAC balancing results
2. Customer billing information
3. Chemical hazard and handling information
4. Refrigerant charging instructions

Correct Answer: 3. Chemical hazard and handling information

Explanation:

SDS means Safety Data Sheet. An SDS provides information about a chemical product, including hazards, safe handling, protective measures, storage, emergency response, and other safety information. HVAC cleaning technicians may encounter detergents, coatings, disinfectants, or other chemical products, so understanding SDS information is important for worker and occupant protection. NADCA includes SDS in the ASCS Candidate Guide acronym list and places health and safety within the exam content. Technicians should review applicable product information before use rather than relying only on familiarity with the product name or packaging.

Question 128. What does NIOSH primarily support

1. Occupational safety and health research
2. HVAC equipment manufacturing
3. Building energy billing
4. Duct construction licensing

Correct Answer: 1. Occupational safety and health research

Explanation:

NIOSH stands for the National Institute for Occupational Safety and Health. It conducts research and develops recommendations intended to help prevent work related injury and illness. ASCS technicians can encounter hazards involving airborne particles, chemicals, confined spaces, electrical equipment, moving machinery, and respiratory exposure. NADCA includes NIOSH among the acronyms candidates should recognize. Understanding the roles of workplace safety organizations helps technicians locate credible information and distinguish between regulatory agencies, research organizations, industry associations, and equipment manufacturers when planning safe HVAC cleaning work.

Question 129. What does RPM measure

1. Rotational speed
2. Air humidity
3. Static pressure
4. Filter efficiency

Correct Answer: 2. Rotational speed

Explanation:

RPM means Revolutions Per Minute and is used to express rotational speed. Fans, blowers, motors, brushes, and other rotating equipment can be described using RPM. Understanding rotational speed is useful because cleaning technicians work around both HVAC machinery and powered cleaning tools. Excessive speed or improper equipment use can damage components or create safety hazards. NADCA includes RPM in the ASCS Candidate Guide acronym list because mechanical and safety knowledge are both important examination areas. Technicians should use powered tools according to manufacturer instructions and project requirements.

Question 130. What is a sound attenuator designed to reduce

1. Refrigerant pressure
2. Condensate flow
3. Duct size
4. Airborne system noise

Correct Answer: 4. Airborne system noise

Explanation:

A sound attenuator is installed in an HVAC air distribution system to reduce transmitted noise while allowing airflow to continue. These components may contain internal acoustic materials or baffles and therefore require careful evaluation before cleaning. Aggressive tools can damage internal surfaces or acoustic materials. NADCA specifically identifies sound attenuators as recommended study material in the current ASCS Candidate Guide. Technicians should understand their purpose and construction so cleaning methods remove contamination without compromising acoustic performance, airflow characteristics, or component integrity.

Question 131. What is a fan coil unit

1. A local HVAC unit containing a fan and coil
2. A duct access panel
3. A refrigerant storage tank
4. A smoke control device

Correct Answer: 1. A local HVAC unit containing a fan and coil

Explanation:

A fan coil unit generally combines a fan with a heating or cooling coil to condition air near the space it serves. Fan coil units can also contain filters, drain pans, controls, and other components that may collect contamination. NADCA specifically lists fan coil units among the recommended topics in the HVAC Inspection Manual for ASCS preparation. Technicians should recognize the component and understand that cleaning may require attention to the fan, coil, drain system, and accessible air side surfaces while protecting electrical and control components from damage.

Question 132. What is a reheat coil used to do

1. Increase return duct size
2. Remove filtration
3. Warm air after earlier conditioning
4. Increase exhaust flow

Correct Answer: 3. Warm air after earlier conditioning

Explanation:

A reheat coil warms an air stream after it has already undergone another conditioning process, often after cooling and dehumidification. Reheat can help maintain zone temperature while preserving moisture control. NADCA identifies heating, cooling, and reheat coils among the mechanical topics candidates should review for the ASCS examination. These coils can accumulate dust and debris and may require cleaning when contaminated. Technicians should understand their function and construction so appropriate cleaning procedures are selected without bending fins, damaging controls, or allowing removed debris to migrate elsewhere in the system.

Question 133. What is a multi zone HVAC system designed to serve

1. One outdoor intake only
2. One filter only
3. One fixed temperature space only
4. Multiple areas with different conditioning needs

Correct Answer: 4. Multiple areas with different conditioning needs

Explanation:

A multi zone system is designed to serve several building areas that may have different heating or cooling requirements. The system can use separate air paths, dampers, coils, controls, or other arrangements to deliver different conditions to individual zones. NADCA lists multi zone systems among the mechanical topics recommended for ASCS preparation. Understanding system configuration is important because cleaning plans must account for multiple branches and components. Technicians should identify the airflow path correctly so contaminants are removed systematically and cleaned areas are not recontaminated from untreated sections.

Question 134. Why should portable electric tools be inspected before use

1. To identify damage that could create a safety hazard
2. To change their operating voltage
3. To increase duct airflow
4. To reduce filter loading

Correct Answer: 1. To identify damage that could create a safety hazard

Explanation:

Portable electric tools can present shock, fire, and mechanical hazards if cords, plugs, guards, switches, or housings are damaged. Technicians should inspect tools before use and remove defective equipment from service according to applicable safety procedures. The current ASCS Candidate Guide specifically lists portable electric tools as a recommended Safety Manual topic. HVAC cleaning frequently takes place around metal ductwork, moisture, ladders, and restricted spaces, making electrical safety especially important. Proper inspection and maintenance reduce the chance that cleaning equipment creates an avoidable worker or building hazard.

Question 135. Who has final authority over whether a chemical product is applied in an HVAC system

1. The equipment manufacturer only
2. The system owner
3. The cleaning technician only
4. The filter supplier

Correct Answer: 2. The system owner

Explanation:

NADCA’s chemical products position paper states that the decision about whether to apply a chemical product in an HVAC system ultimately rests with the system owner. Industry professionals can provide information and recommendations, but the owner makes the final decision. Any proposed chemical must also be appropriate for the intended application and used according to applicable requirements and product instructions. Chemical use should never replace proper source removal cleaning. Technicians should clearly communicate why a product is being considered, what it is intended to accomplish, and any relevant limitations before application.

Question 136. What is the primary purpose of a duct sealant

1. Remove biological contamination
2. Increase fan speed
3. Reduce air leakage
4. Replace duct cleaning

Correct Answer: 3. Reduce air leakage

Explanation:

A duct sealant is used to seal joints, connections, gaps, and openings so unwanted air leakage is reduced. Sealants can include materials such as mastics, tapes, and other products designed for suitable HVAC applications. NADCA materials distinguish sealants from coatings used for resurfacing damaged or degraded surfaces. Neither type of product should be considered a substitute for source removal cleaning when contamination is present. The technician should understand the purpose of the product and use it only for an appropriate application after required cleaning and surface preparation have been completed.

Question 137. What is the purpose of a repair coating inside an HVAC system

1. Resurface damaged or degraded material
2. Increase refrigerant charge
3. Eliminate all cleaning
4. Increase duct pressure

Correct Answer: 1. Resurface damaged or degraded material

Explanation:

Repair coatings are resurfacing materials applied to surfaces showing damage or degradation. They may be appropriate in certain restoration situations when the material can be effectively repaired rather than replaced. NADCA materials emphasize that coatings should never be used instead of source removal cleaning. Contamination should first be physically removed and the surface properly prepared before any suitable coating is considered. Some coatings may contain antimicrobial ingredients intended to protect the coating film, but that feature does not turn the coating into a substitute for cleaning contaminated HVAC components.

Question 138. What should happen before selecting a chemical product for HVAC use

1. Ignore the product label
2. Apply the product everywhere
3. Mix it with other chemicals
4. Confirm suitability for the specific application

Correct Answer: 4. Confirm suitability for the specific application

Explanation:

A chemical product should only be used when it is appropriate for the intended HVAC application. The technician should review the product label, safety information, material compatibility, applicable regulations, and project requirements before use. NADCA recognizes that each HVAC system and contamination situation can differ, so chemical applications require professional judgment. The system owner must also be involved in the decision. Chemical treatment should not be used as a shortcut around mechanical source removal, and the product must not damage components or negatively affect normal system operation.

Question 139. Which organization publishes NFPA 90A

1. ASHRAE
2. NAIMA
3. National Fire Protection Association
4. ACCA

Correct Answer: 3. National Fire Protection Association

Explanation:

NFPA 90A is published by the National Fire Protection Association. The current ASCS Candidate Guide identifies NFPA 90A as an additional industry reference related to installation of air conditioning and ventilation systems. ASCS technicians should understand that HVAC systems interact with building fire protection requirements, particularly around fire dampers, smoke dampers, penetrations, and duct construction. Cleaning work must not compromise these safety features. Knowing which organization publishes a standard also helps technicians locate authoritative guidance when questions arise during inspection, cleaning, or restoration work.

Question 140. Which reference addresses professional mold remediation

1. NFPA 90A
2. IICRC S520
3. NAIMA AH 122
4. ACCA Manual D

Correct Answer: 2. IICRC S520

Explanation:

IICRC S520 is the Standard and Reference Guide for Professional Mold Remediation. NADCA lists it among the additional industry references recommended in the current ASCS Candidate Guide. HVAC cleaning projects can sometimes involve suspected microbial contamination, so ASCS professionals need awareness of related remediation standards even when another qualified specialist leads the environmental assessment. Understanding the role of IICRC S520 helps technicians recognize that mold remediation involves more than ordinary dust removal and may require specific containment, safety, documentation, and remediation practices appropriate to the project conditions.