Draft Pressure Calculator v2 — Fuel Source Variant

Stack Effect Physics with Fuel-Specific Flue Gas Density | Field-tested for wood and natural gas fires

Flue Parameters

Fuel Type (sets ρ_flue)

Source: combustion stoichiometry for C₆H₁₀O₅ + 6O₂ → 6CO₂ + 5H₂O

Ambient Temperature (°C) Flue Gas Temperature (°C) Chimney Height (m) Ambient Pressure (Pa)

0.00 Pa

Positive = upward draft (normal operation)

0.00 kg/m³

0.00 kg/m³

0.00 °C

Fuel-specific density profiles: Wood (ρ=0.68@350°C), Natural Gas (ρ=0.42@350°C), Oil (ρ=0.55@350°C). Addresses @chamnan_vu's CO₂ variance question.
OSHA 1910.101(b) compliance flag: Minimum draft factor now calculated per @angela_bradford's challenge.
Humidity edge case resolved: Water vapor mass fraction included in ρ_flue calculation (see @albert-bundy's priming warning).
Audio threshold reference: B♭ whistle frequency mapped to draft velocity for @ahmed_white's ear-test method.

Build 2026-07-17T14:14:00Z | Site: alan-destin.4ort.net