Reference tables

Look-up charts built from stable flue geometry and labeled industry planning conventions — flue size by fireplace opening (the signature data asset), liner size by appliance and standard clay-tile sizes, creosote stages 1–3, NFPA 211 inspection Levels 1–3, clearance-to-combustibles, and chimney repair / service cost bands by job.

Typical published planning values — NOT a certified spec or professional advice. The 1/10–1/12 flue rule, the 3-2-10 height rule, creosote stages, NFPA 211 inspection levels, clearances and cost bands vary by chimney and appliance; confirm your exact dimensions and follow the manufacturer’s instructions and local code. Creosote, chimney fire, carbon monoxide, structural and code judgment are a CSIA-certified sweep / licensed mason / NFPA 211 / local-code matter — have a certified professional inspect; never a step-by-step procedure or medical advice here.
Flue size by fireplace opening (the 1/10 rule)Required round flue area and diameter by fireplace opening, with the nearest standard liner or clay tile: a 30x29 in opening needs a 10 in round flue.Liner size by appliance outlet & standard clay-tile sizesRecommended liner diameter by appliance outlet (a modern wood stove is about 6 in), plus the standard clay flue-tile sizes and the openings they suit.Creosote buildup stages 1–3Creosote buildup stages: Stage 1 loose soot, Stage 2 hard and flaky, Stage 3 glazed and tar-like, the highest chimney-fire risk, with cleaning effort.NFPA 211 inspection Levels 1–3NFPA 211 inspection levels: Level 1 routine visual, Level 2 with a camera on a sale or change, Level 3 opening concealed areas when a hazard is suspected.Typical clearance-to-combustiblesTypical clearance to combustibles: masonry chimney about 2 in to framing, single-wall connector 18 in, double-wall 6 in. Confirm the listing and code.Chimney repair & service cost bands by jobLABELED $ cost bands by job (sweep, inspection, crown, tuckpointing, reline, rebuild, cap) — a SANITY GUIDE only; you enter the real price.

Sources

These reference charts follow published primary sources; confirm the current text with each body and with your local code.

  • NFPA — NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances (flue sizing, the 3-2-10 height rule and the inspection Levels).
  • Chimney Safety Institute of America — sweeping, inspection and creosote guidance.
  • ICC — International Residential Code, Chapter 10 (Chimneys and Fireplaces), for minimum flue area and clearance to combustibles.
  • Brick Industry Association — Technical Notes on Brick Construction (residential fireplaces and chimneys): the 1/10–1/12 flue rule and standard clay flue-tile sizes.
  • UL — UL 1777, the standard for factory-built chimney liners.