Mine Ventilation Airflow Calc

Planning underground ventilation and need to know the required CFM for your crew size, diesel equipment, and airway dimensions? This calculator gives you MSHA-compliant airflow requirements in seconds. Select mine type (coal, metal/non-metal, or tunnel), enter airway shape and dimensions, and specify personnel and diesel HP underground. Get required airflow, air velocity, and resistance calculations instantly. WHAT YOU GET: - Required CFM based on personnel count (MSHA minimums) - Diesel dilution airflow requirement - Airway cross-section area for rectangular, arch, or circular openings - Air velocity at the calculated flow rate - Airway resistance using Atkinson friction factors - Fan pressure requirements MINE TYPES: Coal (30 CFR 75.325), Metal/Non-Metal (30 CFR 57.8520), and Tunnel — each with correct minimum CFM per person and velocity requirements. AIRWAY SHAPES: Rectangular, arch (horseshoe), and circular — with proper area and perimeter calculations for each. RESISTANCE: Atkinson friction factor input with typical ranges for smooth (40-60) and rough (80-120) airways. Works completely offline. No account required. Built for mining engineers, ventilation planners, and safety officers who need fast, MSHA-referenced airflow calculations underground.