BPI Health, Safety & Energy Efficiency 2 — Questions and Answers
Question 1: Which combustion safety test measures the pressure difference between the CAZ and the outdoors to assess backdrafting risk?
- Blower door depressurization test
- Building Pressure Test (BPT) (Correct answer)
- Duct blaster test
- Tracer gas test
Correct answer: Building Pressure Test (BPT)
The Building Pressure Test (BPT) measures the pressure in the combustion appliance zone relative to outdoors to identify backdrafting potential.
Question 2: A homeowner reports headaches and fatigue only when the furnace is running. What is the most likely cause?
- High indoor humidity levels
- Carbon monoxide from a cracked heat exchanger (Correct answer)
- Radon gas accumulation
- VOCs from new furnace filters
Correct answer: Carbon monoxide from a cracked heat exchanger
Symptoms correlated with furnace operation strongly suggest CO poisoning from a cracked heat exchanger leaking combustion gases into living space.
Question 3: What is the maximum acceptable CO level in ambient air inside a home, per BPI standards?
- 9 ppm (Correct answer)
- 35 ppm
- 70 ppm
- 200 ppm
Correct answer: 9 ppm
BPI standards set 9 ppm as the maximum acceptable ambient CO level inside a home, consistent with EPA's 8-hour NAAQS standard.
Question 4: Which insulation material poses the greatest health risk during installation due to respirable fiber release?
- Cellulose
- Spray polyurethane foam
- Fiberglass batts (Correct answer)
- Mineral wool
Correct answer: Fiberglass batts
Fiberglass batts release respirable glass fibers during cutting and installation, requiring respirator use to prevent lung irritation.
Question 5: In a worst-case depressurization test, which combination of conditions creates the greatest negative pressure in the CAZ?
- All windows open, exhaust fans off, furnace on
- All exhaust fans on, combustion air supply damper closed, blower door installed (Correct answer)
- Only the clothes dryer running with windows open
- Air conditioning running with interior doors open
Correct answer: All exhaust fans on, combustion air supply damper closed, blower door installed
Worst-case conditions combine all exhaust fans operating simultaneously with combustion air restricted, maximizing CAZ depressurization.
Question 6: What does a negative draft reading on an appliance flue indicate?
- Normal draft is occurring
- Backdrafting is occurring (Correct answer)
- The appliance is off
- The flue is oversized
Correct answer: Backdrafting is occurring
A negative reading means combustion gases are flowing back into the living space instead of up the flue, a dangerous backdrafting condition.
Question 7: Which type of ventilation system provides the best control over indoor air quality in a tight home?
- Natural ventilation through operable windows
- Supply-only ventilation
- Exhaust-only ventilation
- Balanced heat recovery ventilation (HRV/ERV) (Correct answer)
Correct answer: Balanced heat recovery ventilation (HRV/ERV)
Balanced HRV/ERV systems both supply and exhaust air, recovering energy while providing consistent, controllable fresh air distribution.
BPI Health, Safety & Energy Efficiency 2
Which combustion safety test measures the pressure difference between the CAZ and the outdoors to assess backdrafting risk?