Maryland Blower Door Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
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1. What is the primary purpose of a blower door test in building
performance assessment?
A. To measure HVAC efficiency
B. To determine insulation R-value
C. To quantify building air leakage rates
D. To test electrical system load
Answer: C
Rationale: A blower door test is specifically designed to measure the
airtightness of a building by determining how much air leakage
occurs through the building envelope under controlled pressure
conditions.
2. Which standard metric is most commonly derived from blower door
testing?
A. BTU/hr
B. ACH50
C. PSI load rating
D. Lux level
Answer: B
Rationale: ACH50 (air changes per hour at 50 Pascals) is the standard
measurement used to express building leakage based on blower door
test results.
,3. In Maryland energy code compliance, blower door testing is primarily
used to verify compliance with which requirement?
A. Structural integrity
B. Electrical grounding
C. Building envelope airtightness
D. Plumbing pressure resistance
Answer: C
Rationale: Maryland adopts IECC-based energy standards where
blower door testing is used to confirm that the building envelope
meets required airtightness thresholds.
4. What device is essential for conducting a blower door test?
A. Infrared thermometer
B. Calibrated fan system
C. Voltmeter
D. Hydrometer
Answer: B
Rationale: A blower door test requires a calibrated fan installed in an
exterior doorway to create controlled pressure differences for
measuring air leakage.
5. During a blower door test, what condition is created inside the
building?
A. Positive pressure
B. Vacuum stabilization
C. Neutral humidity
D. Depressurization
Answer: D
Rationale: The fan removes air from the building, creating a
depressurized condition that draws outside air through leaks.
6. What is the typical pressure difference used during blower door
testing?
A. 5 Pascals
B. 25 Pascals
C. 50 Pascals
D. 100 Pascals
Answer: C
, Rationale: Standard blower door testing is performed at 50 Pascals
to simulate wind pressure conditions for consistent comparison.
7. Which building component is directly assessed by blower door testing?
A. Foundation strength
B. Thermal envelope leakage
C. Roof load capacity
D. Window glazing type
Answer: B
Rationale: The test evaluates how airtight the building envelope is,
including walls, ceilings, floors, and penetrations.
8. What is the main output of a blower door test report?
A. Soil compaction level
B. Air leakage rate
C. Electrical consumption
D. Structural deflection
Answer: B
Rationale: The report primarily provides quantified air leakage
values, usually in ACH50 or CFM50.
9. Which organization protocol is commonly referenced for blower door
testing procedures?
A. OSHA welding standards
B. ASTM standards
C. FAA aviation rules
D. ISO food safety codes
Answer: B
Rationale: Blower door testing procedures are commonly aligned
with ASTM standards such as ASTM E779 for air leakage
measurement.
10. What is the role of a blower door technician?
A. Installing HVAC systems
B. Performing airtightness testing and reporting results
C. Designing electrical layouts
D. Inspecting structural steel welding
Answer: B
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 blower door test in building
performance assessment?
A. To measure HVAC efficiency
B. To determine insulation R-value
C. To quantify building air leakage rates
D. To test electrical system load
Answer: C
Rationale: A blower door test is specifically designed to measure the
airtightness of a building by determining how much air leakage
occurs through the building envelope under controlled pressure
conditions.
2. Which standard metric is most commonly derived from blower door
testing?
A. BTU/hr
B. ACH50
C. PSI load rating
D. Lux level
Answer: B
Rationale: ACH50 (air changes per hour at 50 Pascals) is the standard
measurement used to express building leakage based on blower door
test results.
,3. In Maryland energy code compliance, blower door testing is primarily
used to verify compliance with which requirement?
A. Structural integrity
B. Electrical grounding
C. Building envelope airtightness
D. Plumbing pressure resistance
Answer: C
Rationale: Maryland adopts IECC-based energy standards where
blower door testing is used to confirm that the building envelope
meets required airtightness thresholds.
4. What device is essential for conducting a blower door test?
A. Infrared thermometer
B. Calibrated fan system
C. Voltmeter
D. Hydrometer
Answer: B
Rationale: A blower door test requires a calibrated fan installed in an
exterior doorway to create controlled pressure differences for
measuring air leakage.
5. During a blower door test, what condition is created inside the
building?
A. Positive pressure
B. Vacuum stabilization
C. Neutral humidity
D. Depressurization
Answer: D
Rationale: The fan removes air from the building, creating a
depressurized condition that draws outside air through leaks.
6. What is the typical pressure difference used during blower door
testing?
A. 5 Pascals
B. 25 Pascals
C. 50 Pascals
D. 100 Pascals
Answer: C
, Rationale: Standard blower door testing is performed at 50 Pascals
to simulate wind pressure conditions for consistent comparison.
7. Which building component is directly assessed by blower door testing?
A. Foundation strength
B. Thermal envelope leakage
C. Roof load capacity
D. Window glazing type
Answer: B
Rationale: The test evaluates how airtight the building envelope is,
including walls, ceilings, floors, and penetrations.
8. What is the main output of a blower door test report?
A. Soil compaction level
B. Air leakage rate
C. Electrical consumption
D. Structural deflection
Answer: B
Rationale: The report primarily provides quantified air leakage
values, usually in ACH50 or CFM50.
9. Which organization protocol is commonly referenced for blower door
testing procedures?
A. OSHA welding standards
B. ASTM standards
C. FAA aviation rules
D. ISO food safety codes
Answer: B
Rationale: Blower door testing procedures are commonly aligned
with ASTM standards such as ASTM E779 for air leakage
measurement.
10. What is the role of a blower door technician?
A. Installing HVAC systems
B. Performing airtightness testing and reporting results
C. Designing electrical layouts
D. Inspecting structural steel welding
Answer: B
