CCS Fire Prevention & Creosote Management 2 — Questions and Answers
Question 1: At what temperature does Class 3 (glazed) creosote typically ignite during a chimney fire?
- Around 451°F (233°C)
- Around 800°F (427°C)
- Around 1,200°F (649°C) (Correct answer)
- Around 2,000°F (1,093°C)
Correct answer: Around 1,200°F (649°C)
Glazed creosote can ignite at approximately 1,200°F and burn at temperatures exceeding 2,000°F, making it the most hazardous form.
Question 2: Which burning practice most accelerates the transition of creosote from Class 1 to Class 3?
- Burning hardwoods at high temperatures
- Burning green or wet wood with smoldering fires (Correct answer)
- Using a fireplace insert with a tight-fitting door
- Burning fires for short durations at full draft
Correct answer: Burning green or wet wood with smoldering fires
Smoldering fires fueled by wet or green wood produce large quantities of smoke and condensation, rapidly depositing glazed creosote.
Question 3: A homeowner reports that a chemical chimney-cleaning log reduced visible soot. What should the sweep advise?
- Chemical logs are a complete substitute for professional sweeping
- Chemical logs are banned by the EPA and should not be used
- Chemical logs may loosen deposits but do not replace mechanical cleaning (Correct answer)
- Chemical logs are only effective on Class 3 creosote
Correct answer: Chemical logs may loosen deposits but do not replace mechanical cleaning
Anti-creosote chemical logs can chemically alter deposits to make them easier to brush away, but mechanical cleaning by a professional is still required.
Question 4: Which NFPA standard specifically addresses the inspection, cleaning, and restoration of residential chimneys and fireplaces?
- NFPA 54
- NFPA 211 (Correct answer)
- NFPA 72
- NFPA 101
Correct answer: NFPA 211
NFPA 211 is the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, which governs residential chimney services.
Question 5: What is the primary reason a smoke chamber with a rough, corbeled surface is a fire hazard?
- It restricts airflow, causing backdrafts
- Its irregular surface traps creosote and is difficult to clean thoroughly (Correct answer)
- It conducts heat into adjacent framing faster than a smooth chamber
- It prevents the damper from seating properly
Correct answer: Its irregular surface traps creosote and is difficult to clean thoroughly
A corbeled smoke chamber surface creates pockets where creosote accumulates and is nearly impossible to remove completely with standard brushes.
Question 6: When is it appropriate to use a rotary cleaning system rather than standard brushes on a flue?
- Whenever the flue is taller than 20 feet
- When heavy or hardened creosote deposits require more aggressive mechanical action (Correct answer)
- On all Class 1 deposits to save time
- Only on metal flue liners, never on clay tile
Correct answer: When heavy or hardened creosote deposits require more aggressive mechanical action
Rotary systems spin flexible rods and aggressive brushes to break up heavy or hardened deposits that standard brushes cannot remove.
Question 7: A chimney sweep notices that a chimney fire has occurred but the homeowner did not realize it. Which evidence most strongly confirms a past chimney fire?
- Light gray powdery ash at the firebox floor
- Puffy, expanded, or honeycombed creosote deposits in the flue (Correct answer)
- A faint smoke odor in the living room
- Mortar dust on the smoke shelf
Correct answer: Puffy, expanded, or honeycombed creosote deposits in the flue
Puffy, popcorn-like, or honeycombed (puffed) creosote is a classic indicator that a previous chimney fire burned and partially combusted existing deposits.
CCS Fire Prevention & Creosote Management 2
At what temperature does Class 3 (glazed) creosote typically ignite during a chimney fire?