Chimney Cleaning & Maintenance Flashcards

A homeowner's flue has hard, shiny, tar-like glazed creosote that a standard wire brush will not remove. What is the most appropriate approach?

Answer: Use a chemical creosote modifier and/or rotary cutting tools designed for glazed deposits

Third-degree glazed creosote typically requires chemical treatment or rotary removal tools because ordinary brushing will not dislodge it.

Why do sweeps run a high-powered vacuum, often with HEPA filtration, at the firebox opening during cleaning?

Answer: To create negative pressure that keeps soot and fine particles out of the living space

The vacuum creates negative pressure at the opening so soot does not escape into the home.

Which brush type is generally recommended for cleaning a stainless steel chimney liner?

Answer: Polypropylene (poly) brush

Poly brushes clean stainless liners without scratching or damaging the metal, as most liner manufacturers recommend.

According to NFPA 211, how often should chimneys, fireplaces, and vents be inspected?

Answer: At least once a year

NFPA 211 calls for an annual inspection of chimneys, fireplaces, and vents.

Which situation would require at least a Level 2 inspection under NFPA 211?

Answer: A change in fuel type or the sale/transfer of the property

Level 2 inspections are required when the system changes (fuel type, appliance), at property sale or transfer, or after an operating malfunction or chimney fire.

Per common industry guidance, at what level of accumulated soot or creosote should a flue be cleaned?

Answer: 1/8 inch

A deposit of about 1/8 inch is widely used as the threshold for cleaning, because that much buildup is enough to feed a chimney fire.

What is the main benefit of parging a rough, stepped smoke chamber with refractory mortar?

Answer: It creates a smooth surface that improves draft and reduces creosote buildup

A smooth parged smoke chamber reduces turbulence and gives creosote fewer ledges to collect on, and it also closes gaps.