Chimney Draft
Calculate Chimney Draft instantly with the exact formula and a worked example.
Chimney Draft
Chimney heightm
Outdoor temperature°C
Average flue gas temperature°C
Draft
26.8104Pa
Outdoor air density
1.292kg/m³
Flue gas density
0.746kg/m³
Rating
Strong draft — a damper may be needed
More about: Chimney Draft
What it calculates
The “Chimney Draft” calculator computes Draft in Pa from 3 parameters: chimney height (m), outdoor temperature (°C), average flue gas temperature (°C).
Used in design, material estimation, and structural calculations.
Example calculation
With parameters Chimney height = 5 m, Outdoor temperature = 0 °C, Average flue gas temperature = 200 °C the result is 26.81 Pa.
How to use
- Enter chimney height, outdoor temperature and average flue gas temperature — each field above is adjustable with a slider.
- Draft (Pa) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Chimney Draft calculated?
The Chimney Draft calculator computes Draft (in Pa) from chimney height, outdoor temperature, average flue gas temperature. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Chimney Draft calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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