Dynamic loss (in w.c.) = C * (Velocity_Pressure) Where = (Velocity_fpm / 4005)^2
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This sheet anchors the documentation. Include metadata such as: Project Name / Project ID System Tag (e.g., AHU-01, FAHU-02) Design Airflow (Total CFM) Duct Material Selection (Galvanized Iron, Aluminum) Safety Factor percentage (typically 10% to 15%) Tab 2: The Core Calculation Sheet Dynamic loss (in w
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Step 3: Account for Fittings (Equivalent Length vs. Coefficient Method) You can account for fittings using two methods in Excel: