HERS Diagnostics & Performance Testing 1 — Questions and Answers
Question 1: What does a blower door test measure?
- Indoor air quality
- Window performance
- Air leakage in the building envelope (Correct answer)
- Ventilation system efficiency
Correct answer: Air leakage in the building envelope
A blower door test quantifies the air leakage in a home, helping assess its airtightness and energy efficiency.
Question 2: Which device is used during duct leakage testing?
- Blower door
- Manometer
- Thermometer
- Duct blaster (Correct answer)
Correct answer: Duct blaster
A duct blaster is specifically designed to pressurize and measure leakage in duct systems.
Question 3: Why is it important to conduct combustion safety testing?
- To check insulation levels
- To measure airflow from windows
- To verify safe venting of combustion gases (Correct answer)
- To adjust lighting controls
Correct answer: To verify safe venting of combustion gases
Combustion safety testing ensures fuel-burning appliances are venting properly and not posing carbon monoxide risks.
Question 4: What measurement is typically used to express air leakage during a blower door test?
- BTU/hr
- CFM50 (Correct answer)
- ACH10
- kWh
Correct answer: CFM50
CFM50 stands for Cubic Feet per Minute at 50 Pascals of pressure, which is the standard for blower door tests.
Question 5: Which reading on a manometer indicates a significant pressure difference during testing?
- 0.1 Pa
- 1.0 Pa
- 5.0 Pa
- 50.0 Pa (Correct answer)
Correct answer: 50.0 Pa
A large pressure difference indicates leaks or issues in airflow, which may require further inspection or sealing.
Question 6: What is the purpose of pressure diagnostics in home performance testing?
- To estimate heating costs
- To balance electrical loads
- To locate air leakage paths and pressure imbalances (Correct answer)
- To set thermostat schedules
Correct answer: To locate air leakage paths and pressure imbalances
Pressure diagnostics help identify air movement pathways and imbalances that may affect energy performance.
HERS Diagnostics & Performance Testing 1
What does a blower door test measure?