Fan Engineering — Auxiliary Duct Leakage
Auxiliary Duct Leakage for mine and tunnel fan systems.
Leakage compounds like negative interest: 7% per hundred metres over a 400 m heading delivers barely three-quarters of the fan's effort. The fix hierarchy never changes — couplings first, tears second, a bigger fan a distant last. The face anemometer reading, not the fan nameplate, is the legal quantity.
Formula
Note: Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
Auxiliary Duct Leakage for mine and tunnel fan systems. A free mine ventilation & air quality tool — no sign-up, no upload, instant results in your browser.
About Fan Engineering — Auxiliary Duct Leakage
Fan Engineering — Auxiliary Duct Leakage computes the governing relationship Q_face = Q_fan × (1 − leak%)^(L/100) live as you type. Leakage compounds like negative interest: 7% per hundred metres over a 400 m heading delivers barely three-quarters of the fan's effort. The fix hierarchy never changes — couplings first, tears second, a bigger fan a distant last. The face anemometer reading, not the fan nameplate, is the legal quantity. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Fan Engineering — Auxiliary Duct Leakage
- 1Enter your values — Fan inlet quantity, Duct length, Leakage per 100 m (sensible defaults are pre-filled).
- 2Read the live results: Delivered at face, Air lost to leakage.
- 3Check the "with your numbers" line to see Q_face = Q_fan × (1 − leak%)^(L/100) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Fan Engineering — Auxiliary Duct Leakage?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula Q_face = Q_fan × (1 − leak%)^(L/100) with authoritative sources cited on the page (McPherson, M.J., Subsurface Ventilation and Environmental Engineering; Hartman et al., Mine Ventilation and Air Conditioning, 3rd ed.)
- ✓Leakage compounds like negative interest: 7% per hundred metres over a 400 m heading delivers barely three-quarters of the fan's effort.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the fan engineering — auxiliary duct leakage use?+
It evaluates Q_face = Q_fan × (1 − leak%)^(L/100), exactly as published. Sources: McPherson, M.J., Subsurface Ventilation and Environmental Engineering; Hartman et al., Mine Ventilation and Air Conditioning, 3rd ed.. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Leakage compounds like negative interest: 7% per hundred metres over a 400 m heading delivers barely three-quarters of the fan's effort. Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
When is this calculator the right tool for the job?+
Auxiliary Duct Leakage for mine and tunnel fan systems. A free mine ventilation & air quality tool. The fix hierarchy never changes — couplings first, tears second, a bigger fan a distant last. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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