Maryland Blower Door Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. What is the primary purpose of a Maryland Blower Door Technician
Certification?
A. To authorize HVAC system design for residential buildings
B. To certify individuals in performing airtightness testing of building
envelopes using blower door equipment
C. To license contractors for full building construction in Maryland
D. To approve electrical wiring inspections in new developments
The correct answer is B. A blower door technician certification
focuses on training and validating professionals who measure
building airtightness using calibrated fan systems, which is essential
for energy efficiency and code compliance.
2. Which core principle does a blower door test primarily evaluate in a
building?
A. Structural load-bearing capacity
B. Electrical system continuity
C. Air leakage and envelope airtightness
, D. Plumbing pressure stability
The correct answer is C. The test quantifies how much air leaks
through gaps in the building envelope, which directly affects energy
efficiency and indoor comfort.
3. During a blower door test, what equipment is typically installed in an
exterior doorway?
A. Thermal imaging scanner
B. Calibrated airflow fan system
C. Infrared moisture probe
D. Carbon monoxide detector array
The correct answer is B. A calibrated fan is mounted in a doorframe
to depressurize or pressurize the building and measure air leakage
rates.
4. At what standard pressure is a typical blower door test performed?
A. 10 Pascals
B. 25 Pascals
C. 50 Pascals
D. 100 Pascals
The correct answer is C. Most blower door tests are standardized at
50 Pascals to simulate consistent pressure differences for measuring
air leakage.
5. What does the measurement ACH50 refer to in blower door testing?
A. Air changes per hour at 50 Pascals
B. Average cooling hours at 50% humidity
C. Air circulation heating at 50 degrees
D. Annual carbon heating output
The correct answer is A. ACH50 represents how many times the air
inside a building is replaced per hour at 50 Pascals of pressure.
, 6. Which organization is commonly associated with blower door
certification programs in building science practice?
A. American Bar Association
B. Air Barrier Association of America
C. Federal Housing Finance Agency
D. National Electrical Contractors Association
The correct answer is B. The Air Barrier Association of America
provides recognized training and certification programs for
airtightness testing professionals.
7. What is a key outcome of a properly conducted blower door test?
A. Certification of electrical safety compliance
B. Identification of air leakage points in a building envelope
C. Measurement of groundwater infiltration
D. Verification of structural steel alignment
The correct answer is B. The test helps locate and quantify leaks in
walls, windows, doors, and other envelope components.
8. Which condition is required before starting a blower door test?
A. All exterior doors and windows are open
B. Mechanical ventilation systems are turned off
C. HVAC systems must be running at full capacity
D. Interior doors must be locked shut
The correct answer is B. Mechanical ventilation is usually turned off
to prevent interference with pressure readings and ensure accurate
leakage measurement.
9. What is the main purpose of depressurizing a building during a blower
door test?
A. To cool the interior space rapidly
B. To force outside air infiltration through leaks for measurement
C. To dry interior wall cavities
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of a Maryland Blower Door Technician
Certification?
A. To authorize HVAC system design for residential buildings
B. To certify individuals in performing airtightness testing of building
envelopes using blower door equipment
C. To license contractors for full building construction in Maryland
D. To approve electrical wiring inspections in new developments
The correct answer is B. A blower door technician certification
focuses on training and validating professionals who measure
building airtightness using calibrated fan systems, which is essential
for energy efficiency and code compliance.
2. Which core principle does a blower door test primarily evaluate in a
building?
A. Structural load-bearing capacity
B. Electrical system continuity
C. Air leakage and envelope airtightness
, D. Plumbing pressure stability
The correct answer is C. The test quantifies how much air leaks
through gaps in the building envelope, which directly affects energy
efficiency and indoor comfort.
3. During a blower door test, what equipment is typically installed in an
exterior doorway?
A. Thermal imaging scanner
B. Calibrated airflow fan system
C. Infrared moisture probe
D. Carbon monoxide detector array
The correct answer is B. A calibrated fan is mounted in a doorframe
to depressurize or pressurize the building and measure air leakage
rates.
4. At what standard pressure is a typical blower door test performed?
A. 10 Pascals
B. 25 Pascals
C. 50 Pascals
D. 100 Pascals
The correct answer is C. Most blower door tests are standardized at
50 Pascals to simulate consistent pressure differences for measuring
air leakage.
5. What does the measurement ACH50 refer to in blower door testing?
A. Air changes per hour at 50 Pascals
B. Average cooling hours at 50% humidity
C. Air circulation heating at 50 degrees
D. Annual carbon heating output
The correct answer is A. ACH50 represents how many times the air
inside a building is replaced per hour at 50 Pascals of pressure.
, 6. Which organization is commonly associated with blower door
certification programs in building science practice?
A. American Bar Association
B. Air Barrier Association of America
C. Federal Housing Finance Agency
D. National Electrical Contractors Association
The correct answer is B. The Air Barrier Association of America
provides recognized training and certification programs for
airtightness testing professionals.
7. What is a key outcome of a properly conducted blower door test?
A. Certification of electrical safety compliance
B. Identification of air leakage points in a building envelope
C. Measurement of groundwater infiltration
D. Verification of structural steel alignment
The correct answer is B. The test helps locate and quantify leaks in
walls, windows, doors, and other envelope components.
8. Which condition is required before starting a blower door test?
A. All exterior doors and windows are open
B. Mechanical ventilation systems are turned off
C. HVAC systems must be running at full capacity
D. Interior doors must be locked shut
The correct answer is B. Mechanical ventilation is usually turned off
to prevent interference with pressure readings and ensure accurate
leakage measurement.
9. What is the main purpose of depressurizing a building during a blower
door test?
A. To cool the interior space rapidly
B. To force outside air infiltration through leaks for measurement
C. To dry interior wall cavities
