BPI Health and Safety 3 — Questions and Answers
Question 1: What does the term 'worst-case depressurization' measure in BPI combustion safety testing?
- Maximum airflow through the blower door fan
- The most negative house pressure relative to outside under normal operating conditions
- Combustion appliance zone (CAZ) pressure with all exhaust fans and appliances running simultaneously (Correct answer)
- Pressure differential between floors in a multi-story home
Correct answer: Combustion appliance zone (CAZ) pressure with all exhaust fans and appliances running simultaneously
Worst-case depressurization tests the CAZ pressure with all exhaust devices operating simultaneously to find the maximum depressurization the space can experience.
Question 2: Which symptom is most commonly associated with acute low-level carbon monoxide poisoning?
- Sudden nosebleed
- Headache and dizziness (Correct answer)
- Skin rash and itching
- Vision loss
Correct answer: Headache and dizziness
Headache and dizziness are hallmark early symptoms of CO poisoning because CO displaces oxygen in the blood, starving the brain.
Question 3: What is the purpose of a spillage test performed at the draft hood of a naturally aspirated water heater?
- To measure gas pressure at the burner orifice
- To determine flue gas temperature
- To confirm combustion gases are exhausting up the flue and not spilling into the home (Correct answer)
- To test for natural gas leaks at the appliance connection
Correct answer: To confirm combustion gases are exhausting up the flue and not spilling into the home
A spillage test uses smoke or a mirror to verify that flue gases are being drawn up the vent rather than spilling into the conditioned space.
Question 4: Lead-based paint is most hazardous to human health when it is in which condition?
- Intact and painted over with latex paint
- Chalking, flaking, or being sanded and disturbed (Correct answer)
- Located on exterior wood trim
- Applied to metal surfaces
Correct answer: Chalking, flaking, or being sanded and disturbed
Deteriorating or disturbed lead paint releases lead dust and chips, which are the primary exposure pathways causing lead poisoning.
Question 5: A BPI analyst finds CO readings of 400 ppm in the flue of a gas furnace during steady-state operation. What action is required?
- Log the reading and continue testing
- Flag for follow-up at the next annual inspection
- Immediately red-tag and shut down the appliance as it exceeds the 400 ppm threshold (Correct answer)
- Increase combustion air supply and retest
Correct answer: Immediately red-tag and shut down the appliance as it exceeds the 400 ppm threshold
BPI standards require immediate red-tagging and shut-down of any combustion appliance with undiluted flue CO at or above 400 ppm air-free.
Question 6: Which type of insulation material is most commonly associated with vermiculite attic insulation contamination?
- Fiberglass
- Cellulose
- Asbestos (Correct answer)
- Mineral wool
Correct answer: Asbestos
Vermiculite mined from Libby, Montana (marketed as Zonolite) was contaminated with tremolite asbestos and should be treated as ACM.
Question 7: What is the primary health risk from exposure to mold in residential buildings?
- Lead toxicity
- Respiratory irritation, allergic reactions, and asthma exacerbation (Correct answer)
- Carbon monoxide poisoning
- Radon-induced lung cancer
Correct answer: Respiratory irritation, allergic reactions, and asthma exacerbation
Mold exposure causes respiratory symptoms, allergic reactions, and can trigger or worsen asthma, particularly in sensitive individuals.
BPI Health and Safety 3
What does the term 'worst-case depressurization' measure in BPI combustion safety testing?