A fireplace is more than just bricks and fire — its inner structure is designed to channel smoke efficiently.
🔹 Firebox: the combustion zone where heat is produced.
🔹 Throat: a narrow passage that guides hot gases upward.
🔹 Smoke chamber ("lung"): expands and controls airflow, preventing smoke from backing up.
🔹 Flue: the vertical shaft that vents smoke outside.
🔹 Firebrick: retains heat and protects the inner walls.
✅ Proper ventilation and smart design prevent smoke from entering the home and boost heat efficiency.
📌 Knowing how warm air flows is key to building a safe, effective fireplace.
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