NATE Air Distribution Technician
Practice Exam – 2026 Certification Prep
1. What is the primary purpose of air distribution in an HVAC system?
A. Heat generation
B. Moisture removal
C. Deliver conditioned air to occupied spaces
D. Filter contaminants
Correct Answer: C
Rationale: Air distribution ensures conditioned air is properly
delivered throughout the building to maintain comfort and indoor air
quality.
2. Which component controls airflow volume in a duct system?
A. Heat exchanger
B. Damper
C. Evaporator coil
D. Compressor
Correct Answer: B
Rationale: Dampers regulate or balance airflow by restricting or
allowing air passage within ducts.
3. Which type of duct has the lowest air friction loss?
,A. Flexible duct
B. Fiberglass duct board
C. Smooth metal duct
D. Corrugated duct
Correct Answer: C
Rationale: Smooth metal ducts provide the least resistance to airflow
compared to other duct materials.
4. What instrument is used to measure air velocity?
A. Manometer
B. Hygrometer
C. Anemometer
D. Psychrometer
Correct Answer: C
Rationale: An anemometer measures air speed, which is essential for
airflow calculations.
5. Excessive static pressure in a duct system usually indicates:
A. Oversized ducts
B. Restricted airflow
C. Low fan speed
D. Leaky ducts
,Correct Answer: B
Rationale: High static pressure results from obstructions, dirty filters,
or undersized ductwork.
6. What is the recommended maximum air velocity for residential
supply ducts?
A. 300 FPM
B. 700–900 FPM
C. 1,500 FPM
D. 2,000 FPM
Correct Answer: B
Rationale: Residential systems balance efficiency and noise by keeping
velocities within this range.
7. Which fitting causes the greatest pressure drop?
A. Straight duct
B. Radius elbow
C. Square 90° elbow
D. Transition
Correct Answer: C
Rationale: Sharp turns disrupt airflow and create turbulence,
increasing pressure loss.
8. What does “CFM” stand for?
, A. Cycles per minute
B. Cooling force measurement
C. Cubic feet per minute
D. Condensed flow measurement
Correct Answer: C
Rationale: CFM is the standard unit for measuring airflow volume.
9. Which duct system design method ensures equal pressure drop to
all outlets?
A. Trunk-and-branch
B. Equal friction
C. Radial
D. Extended plenum
Correct Answer: B
Rationale: The equal friction method maintains consistent pressure
loss across duct runs.
10. What is the purpose of a return air system?
A. Add fresh air
B. Return air to the air handler for reconditioning
C. Exhaust air outdoors
D. Increase humidity
Practice Exam – 2026 Certification Prep
1. What is the primary purpose of air distribution in an HVAC system?
A. Heat generation
B. Moisture removal
C. Deliver conditioned air to occupied spaces
D. Filter contaminants
Correct Answer: C
Rationale: Air distribution ensures conditioned air is properly
delivered throughout the building to maintain comfort and indoor air
quality.
2. Which component controls airflow volume in a duct system?
A. Heat exchanger
B. Damper
C. Evaporator coil
D. Compressor
Correct Answer: B
Rationale: Dampers regulate or balance airflow by restricting or
allowing air passage within ducts.
3. Which type of duct has the lowest air friction loss?
,A. Flexible duct
B. Fiberglass duct board
C. Smooth metal duct
D. Corrugated duct
Correct Answer: C
Rationale: Smooth metal ducts provide the least resistance to airflow
compared to other duct materials.
4. What instrument is used to measure air velocity?
A. Manometer
B. Hygrometer
C. Anemometer
D. Psychrometer
Correct Answer: C
Rationale: An anemometer measures air speed, which is essential for
airflow calculations.
5. Excessive static pressure in a duct system usually indicates:
A. Oversized ducts
B. Restricted airflow
C. Low fan speed
D. Leaky ducts
,Correct Answer: B
Rationale: High static pressure results from obstructions, dirty filters,
or undersized ductwork.
6. What is the recommended maximum air velocity for residential
supply ducts?
A. 300 FPM
B. 700–900 FPM
C. 1,500 FPM
D. 2,000 FPM
Correct Answer: B
Rationale: Residential systems balance efficiency and noise by keeping
velocities within this range.
7. Which fitting causes the greatest pressure drop?
A. Straight duct
B. Radius elbow
C. Square 90° elbow
D. Transition
Correct Answer: C
Rationale: Sharp turns disrupt airflow and create turbulence,
increasing pressure loss.
8. What does “CFM” stand for?
, A. Cycles per minute
B. Cooling force measurement
C. Cubic feet per minute
D. Condensed flow measurement
Correct Answer: C
Rationale: CFM is the standard unit for measuring airflow volume.
9. Which duct system design method ensures equal pressure drop to
all outlets?
A. Trunk-and-branch
B. Equal friction
C. Radial
D. Extended plenum
Correct Answer: B
Rationale: The equal friction method maintains consistent pressure
loss across duct runs.
10. What is the purpose of a return air system?
A. Add fresh air
B. Return air to the air handler for reconditioning
C. Exhaust air outdoors
D. Increase humidity
