BPI Health and Safety 4 — Questions and Answers
Question 1: What level of radon concentration in a home requires EPA-recommended mitigation action?
- 2 pCi/L
- 4 pCi/L (Correct answer)
- 8 pCi/L
- 10 pCi/L
Correct answer: 4 pCi/L
The EPA action level for radon is 4 picocuries per liter (pCi/L); mitigation is recommended for homes at or above this level.
Question 2: Which gas is heavier than air and can accumulate at low points such as basements and crawlspaces, creating an explosion hazard?
- Carbon monoxide
- Natural gas (methane)
- Propane (LPG) (Correct answer)
- Nitrogen dioxide
Correct answer: Propane (LPG)
Propane has a vapor density greater than 1 (heavier than air) and sinks to low areas, where it can accumulate to explosive concentrations.
Question 3: During a home performance assessment, a client reports persistent condensation on windows and musty odors. What health hazard should the auditor primarily suspect?
- Elevated CO levels
- Radon infiltration from the foundation
- Mold growth due to excess moisture (Correct answer)
- Lead paint deterioration
Correct answer: Mold growth due to excess moisture
Persistent condensation and musty odors are classic indicators of elevated indoor humidity and active mold growth.
Question 4: What is the recommended method for verifying that an atmospheric combustion appliance has adequate combustion air supply?
- Check the manifold gas pressure with a manometer
- Perform a worst-case CAZ depressurization test and record the pressure in pascals (Correct answer)
- Visually inspect the flue pipe for corrosion
- Measure indoor relative humidity near the appliance
Correct answer: Perform a worst-case CAZ depressurization test and record the pressure in pascals
The worst-case CAZ depressurization test quantifies how much negative pressure the combustion appliance zone reaches under maximum competing exhaust conditions.
Question 5: Under OSHA standards, what is the minimum oxygen concentration in a confined space atmosphere that permits entry without supplied-air equipment?
- 16%
- 19.5% (Correct answer)
- 21%
- 23.5%
Correct answer: 19.5%
OSHA defines oxygen-deficient atmosphere as below 19.5%; entry below this threshold requires supplied-air or self-contained breathing apparatus.
Question 6: Which building component is the primary entry point for radon gas into a home?
- Roof vents and attic bypasses
- Cracks and openings in foundation floors and walls (Correct answer)
- Combustion appliance flues
- Window frames and door thresholds
Correct answer: Cracks and openings in foundation floors and walls
Radon, a soil gas, enters homes primarily through cracks, construction joints, and openings in foundation slabs and basement walls.
Question 7: A BPI auditor detects a gas odorant smell near a furnace. What is the correct immediate action?
- Light a match to confirm the presence of gas
- Turn on the exhaust fan to dilute the concentration
- Evacuate occupants, avoid creating sparks, and call the gas utility from outside (Correct answer)
- Apply pipe sealant to all visible joints and retest
Correct answer: Evacuate occupants, avoid creating sparks, and call the gas utility from outside
Suspected gas leaks require immediate evacuation, avoidance of all ignition sources, and notification of the gas utility from a safe location.
BPI Health and Safety 4
What level of radon concentration in a home requires EPA-recommended mitigation action?