CBI Maintenance Protocols 2 — Questions and Answers
Question 1: How often should a standard 1-inch pleated HVAC filter in a typical residence generally be replaced?
- Every week
- Every 1–3 months (Correct answer)
- Every 2 years
- Only when the system stops heating
Correct answer: Every 1–3 months
Most manufacturers recommend replacing 1-inch pleated filters every 1–3 months, depending on occupancy, pets, and dust levels.
Question 2: According to NFPA 72, residential smoke alarms should be replaced at what maximum age?
- 5 years from manufacture
- 10 years from manufacture (Correct answer)
- 15 years from installation
- 20 years from installation
Correct answer: 10 years from manufacture
NFPA 72 requires smoke alarms to be replaced no more than 10 years from the manufacture date printed on the unit.
Question 3: What is the main reason for periodically flushing a tank-type water heater?
- To recharge the anode rod
- To remove accumulated sediment from the tank bottom (Correct answer)
- To reset the thermostat
- To test the gas valve
Correct answer: To remove accumulated sediment from the tank bottom
Annual flushing removes mineral sediment that reduces efficiency, causes rumbling noises, and shortens tank life.
Question 4: What is the generally recommended minimum frequency for cleaning residential gutters?
- Once every 5 years
- Twice a year, typically spring and fall (Correct answer)
- Only after a roof replacement
- Once a decade
Correct answer: Twice a year, typically spring and fall
Gutters should be cleaned at least twice yearly, and more often near trees, so water drains away from the structure.
Question 5: How often should homeowners test smoke alarms using the test button?
- Monthly (Correct answer)
- Every 5 years
- Only when batteries are replaced
- Only during a home inspection
Correct answer: Monthly
Smoke alarm manufacturers and NFPA recommend pressing the test button at least monthly.
Question 6: Why should clothes dryer exhaust ducts be cleaned at least annually?
- To prevent lint buildup that creates a fire hazard (Correct answer)
- To keep the drum belt lubricated
- To lower the dryer's voltage draw
- To keep the moisture sensor calibrated
Correct answer: To prevent lint buildup that creates a fire hazard
Lint buildup in dryer ducts restricts airflow and is a leading cause of residential dryer fires.
Question 7: An inspector notes cracked, separated caulk around a bathtub. What is the primary maintenance concern?
- Water intrusion damaging the subfloor and wall framing (Correct answer)
- Reduced water pressure at the faucet
- Electrical shock risk at the tub
- Higher water heater energy use
Correct answer: Water intrusion damaging the subfloor and wall framing
Failed caulk lets water get behind surrounds and into framing, causing rot and mold.
