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Chimneys and Fireplace Sizing
Chimneys and fireplace sizing for fireplaces and stoves burning wood or coal as fuel
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Chimneys can be separated in two main categories:
- metal
- masonry

Prefab or Metal Chimneys
Prefab or metal chimneys, class A and double or triple walls are usually found in three diameters. Each diameter has a specific useable area, which is also called it's cross section.
The capacity of a chimney to remove smoke and/or energy (BTU's) from an appliance is directly related to the cross section area.
| Chimney Size | Square Inches | Common Venting Uses |
| 6 Inch Inside Diameter | 28.3 | Stoves, Central Heaters |
| 7 Inch Inside Diameter | 38.5 | Stoves, Central Heaters |
| 8 Inch Inside Diameter | 50.3 | Stoves, Small Fireplaces, Central Heaters |
| 10 Inch Inside Diameter | 78.6 | Stoves, Fireplaces, Central Heaters |
| 12 Inch Inside Diameter | 113 | Fireplaces, Central Heaters |
Masonry Flues
| Flue Size (Outside Diameter) |
Square Inches | Common Venting Uses |
| 7 1/2 X 7 1/2 | 31 | Stoves, Central Heaters |
| 8 1/2 x 8 1/2 | 41 | Stoves, Central Heaters |
| 8 1/2 X 13 | 70 | Stoves, Fireplaces, Central Heaters |
| 13 X 13 | 99 | Fireplaces |
| 13 X 18 | 156 | Fireplaces |
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Related Topics
- Combustion - Boiler house topics - fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency
- Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more
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Related Documents
- Air Flow and Velocities due to Natural Draft - Air flow - volume and velocity - due to stack or flue effect caused by indoor hot and outdoor cold temperature difference
- Chimney Area and Boiler Heat Load - Boiler capacity and required chimney area
- Chimney Sizing - Calculating chimney draft and chimney area
- Explosion Doors in Chimneys - Recommended sizes of explosion doors or draught stabilizers for oil firing installations
- Fuel Oil Burners - Pot-type, Gun-type and Rotary-type Oil Burners





