Fire Prevention & Creosote Management Flashcards

Which condition creates the highest risk of a chimney fire within a wood stove system?

Answer: Allowing the stovepipe to become red hot during a hot burn

A red-hot stovepipe indicates the connected flue is likely already experiencing dangerously elevated temperatures consistent with a chimney fire.

What role does the 'stack effect' play in chimney fire risk?

Answer: A strong stack effect increases draft and reduces the likelihood of slow, smoldering fires

A strong stack effect maintains sufficient draft to draw combustion gases quickly through the flue, reducing the cool-surface condensation that forms creosote.

After applying a creosote removal chemical to a Class 3 deposit, how long should a sweep typically wait before attempting mechanical removal?

Answer: A minimum of 24 hours as directed by most product manufacturers

Most chemical creosote modifiers require approximately 24 hours (or as specified by the manufacturer) to alter the deposit's structure before brushing.

Which type of wood produces the least creosote when burned properly in a well-maintained fireplace?

Answer: Kiln-dried or seasoned hardwood with less than 20% moisture content

Properly seasoned hardwood with low moisture content burns hotter and more completely, producing the least amount of creosote.

In a two-story home, the second-floor bedroom shares a wall with the chimney. After a chimney fire, what is the most critical inspection concern for that bedroom?

Answer: Whether heat from the chimney fire has ignited adjacent combustible framing or materials

Chimney fires generate extreme heat that can transfer through cracked masonry or improper clearances and ignite combustible materials in adjacent wall cavities.

What is the recommended minimum flue gas temperature to minimize creosote condensation in a masonry chimney?

Answer: 250°F (121°C)

Maintaining flue gas temperatures above approximately 250°F (121°C) helps prevent the condensation of unburned hydrocarbons that form creosote.

A customer burns exclusively artificial wax logs. What creosote-related advice should the sweep provide?

Answer: Annual inspection is still required; wax logs can leave their own residue and mask underlying deposits

While wax logs generally produce less creosote than wood, they can leave waxy residue and an annual inspection is still required by NFPA 211.