FAQ
TL;DR: 10 m³ of air is needed per kg of coal burned; “Any error can cause a fire” [Elektroda, gaz4, post #13934157] Follow 150 mm clearances and use insulated pass-throughs to keep draft and safety high. Why it matters: wrong pipe or spacing risks 1 000 °C soot-fire temperatures.
Quick Facts
• Black stove-pipe price: ~80 PLN / m [Elektroda, luczija88, post #13932161]
• Minimum 150 mm gap from single-wall flue to combustibles [EN 15287-1]
• 10 m³ combustion air per 1 kg of coal [Elektroda, gaz4, post #14038519]
• Soot fire can spike pipe temperature to ≈1 000 °C ("NFPA Wood Stove Safety")
• Basic ceramic-liner chimney kit: approx. 1 000 – 1 300 PLN (“System-Komin Price List 2024”)
1. Which pipe material is safest for an internal goat-stove chimney?
Use 2 mm black steel or 0.8 mm stainless, certified to EN 1856-2. They resist 600 °C flue gases and occasional 1 000 °C soot fires. Galvanised or thin sheet rusts and can melt at 419 °C, so avoid it [Elektroda, gaz4, post #13934157]
2. Can I replace expensive fireplace pipe with cheap ventilation duct?
No. Vent ducts lack heat rating and sealing. Failure at 450 °C can release CO and ignite wood. "Combustibles must never touch the flue" [Elektroda, gaz4, post #13934157]
3. Do I need a double-wall section through a wall or roof?
Yes. Double-wall or factory-made insulated sleeve keeps outer skin below 85 °C and maintains draft by reducing cooling [EN 15287-1].
4. How large should the opening be where the pipe passes timber?
Cut a hole 2× pipe diameter. Centre the flue, pack the annulus with 50 mm mineral wool, then install a metal collar [EN 1856-2].
5. Tee or elbow for an outside chimney run?
Use a tee with clean-out cap. It lets soot fall into the cap, not the stove. Elbow setups clog faster and need roof-top cleaning [Elektroda, gaz4, post #14023126]
6. Will 1.5 m of uninsulated pipe outside kill draft?
Expect 20–30 % weaker draft and heavy condensate below 5 °C ambient. Creosote builds twice as fast on the cold steel [Elektroda, gaz4, post #14023126]
7. How can I add combustion air without cutting extra vents?
Run a 110 mm PVC or inox duct from outside to the stove base. It delivers the required 10 m³ / kg fuel and stops room depressurisation [Elektroda, gaz4, post #14033558]
8. How often must I clean the chimney?
For weekend use, sweep every 2 months or after 50 kg wood. A goat burning damp wood may clog in two weeks [Elektroda, gaz4, post #14028431]
9. 3-step how-to: sweeping a goat-stove flue
- Extinguish fire, allow pipe to cool below 50 °C.
- Remove clean-out cap or top cowl; run stiff nylon brush full length.
- Collect soot, inspect for cracks, re-fit components.
10. Can hollow clay blocks work without a ceramic liner?
No. Blocks are structural only. Exhaust through bare clay risks cracks and CO leakage [Elektroda, jack63, post #14018674]
11. How do I support heavy vertical pipe on a small cast-iron goat?
Add a wall bracket every 2 m and a floor pedestal just above the stove collar. Do not load more than 20 kg on the appliance flue spigot (“Jeremias Support Guide 2023”).
12. What is a “temp-guard high-pitched cathedral ceiling” called in Polish?
It’s an "przejście dachowe systemowe do dachów stromych"; look under "przejście dachowe izolowane 30–45°" at chimney-supply shops [Elektroda, ScudoScudo, post #16707730]
13. May I combine black stove pipe indoors and stainless twin-wall outside?
Yes, if diameters match and joints stay male-down, female-up. Seal with high-temp silicone rated 1 200 °C and secure with locking bands [Elektroda, luczija88, post #14029858]
14. Cheapest safe setup for a 50 m² brick summer house?
Run 3 m black steel inside, add insulated ceiling pass-through, then 1.5 m stainless twin-wall above roof. Parts cost roughly 900 – 1 100 PLN; meets clearance rules and keeps soot manageable [Elektroda, luczija88, post #14022326]
