BPI Infiltration & Duct Leakage Certification
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. Which device is primarily used to measure building infiltration at 50
Pascals?
A. Manometer
B. Blower door
C. Duct blaster
D. Anemometer
Answer: B
Rationale: A blower door is specifically designed to depressurize or
pressurize a building to 50 Pascals in order to measure air leakage and
infiltration rates such as ACH50.
2. What does CFM50 represent?
A. Airflow through ducts at normal pressure
B. Cubic feet per minute at 50 Pascals
,C. Combustion air flow rate
D. Cooling system airflow
Answer: B
Rationale: CFM50 refers to the airflow (cubic feet per minute) required
to maintain a 50 Pascal pressure difference during a blower door test.
3. What is the primary purpose of duct leakage testing?
A. Measure furnace efficiency
B. Identify refrigerant loss
C. Quantify air leakage in duct systems
D. Measure indoor humidity
Answer: C
Rationale: Duct leakage testing quantifies how much air escapes from
or is drawn into duct systems, impacting HVAC efficiency and comfort.
4. Which condition most increases natural infiltration in a home?
A. Low wind and mild temperature difference
B. High indoor humidity only
C. High stack effect from temperature difference
D. Closed interior doors
,Answer: C
Rationale: The stack effect increases infiltration when warm indoor air
rises and escapes, pulling outside air in through lower leaks.
5. What is the purpose of a pressure pan test?
A. Measure furnace pressure
B. Identify duct leakage locations
C. Test combustion safety
D. Measure airflow at registers
Answer: B
Rationale: A pressure pan helps locate duct leaks by measuring
pressure differences at registers while the duct system is pressurized.
6. Which area is considered part of the building’s pressure boundary?
A. Attic insulation only
B. Exterior sheathing and air barrier
C. Interior drywall only
D. Roof shingles
Answer: B
Rationale: The pressure boundary is the continuous air barrier
, separating indoor and outdoor environments, often including exterior
sheathing and sealed assemblies.
7. What is the main goal of air sealing?
A. Increase mechanical ventilation
B. Reduce uncontrolled air leakage
C. Increase duct leakage
D. Reduce insulation thickness
Answer: B
Rationale: Air sealing reduces uncontrolled air movement, improving
energy efficiency and comfort.
8. Which instrument is used to measure duct leakage?
A. Hygrometer
B. Duct blaster
C. Manometer only
D. Infrared camera
Answer: B
Rationale: A duct blaster pressurizes the duct system to measure
leakage rates.
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which device is primarily used to measure building infiltration at 50
Pascals?
A. Manometer
B. Blower door
C. Duct blaster
D. Anemometer
Answer: B
Rationale: A blower door is specifically designed to depressurize or
pressurize a building to 50 Pascals in order to measure air leakage and
infiltration rates such as ACH50.
2. What does CFM50 represent?
A. Airflow through ducts at normal pressure
B. Cubic feet per minute at 50 Pascals
,C. Combustion air flow rate
D. Cooling system airflow
Answer: B
Rationale: CFM50 refers to the airflow (cubic feet per minute) required
to maintain a 50 Pascal pressure difference during a blower door test.
3. What is the primary purpose of duct leakage testing?
A. Measure furnace efficiency
B. Identify refrigerant loss
C. Quantify air leakage in duct systems
D. Measure indoor humidity
Answer: C
Rationale: Duct leakage testing quantifies how much air escapes from
or is drawn into duct systems, impacting HVAC efficiency and comfort.
4. Which condition most increases natural infiltration in a home?
A. Low wind and mild temperature difference
B. High indoor humidity only
C. High stack effect from temperature difference
D. Closed interior doors
,Answer: C
Rationale: The stack effect increases infiltration when warm indoor air
rises and escapes, pulling outside air in through lower leaks.
5. What is the purpose of a pressure pan test?
A. Measure furnace pressure
B. Identify duct leakage locations
C. Test combustion safety
D. Measure airflow at registers
Answer: B
Rationale: A pressure pan helps locate duct leaks by measuring
pressure differences at registers while the duct system is pressurized.
6. Which area is considered part of the building’s pressure boundary?
A. Attic insulation only
B. Exterior sheathing and air barrier
C. Interior drywall only
D. Roof shingles
Answer: B
Rationale: The pressure boundary is the continuous air barrier
, separating indoor and outdoor environments, often including exterior
sheathing and sealed assemblies.
7. What is the main goal of air sealing?
A. Increase mechanical ventilation
B. Reduce uncontrolled air leakage
C. Increase duct leakage
D. Reduce insulation thickness
Answer: B
Rationale: Air sealing reduces uncontrolled air movement, improving
energy efficiency and comfort.
8. Which instrument is used to measure duct leakage?
A. Hygrometer
B. Duct blaster
C. Manometer only
D. Infrared camera
Answer: B
Rationale: A duct blaster pressurizes the duct system to measure
leakage rates.
