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Built by installers, for installers. Origin Duct Calculator puts the everyday math of industrial ventilation and dust collection right in your pocket. Whether you're laying out a new system, troubleshooting an existing one, or double-checking numbers on the jobsite, get fast, reliable answers without digging for a chart or a spreadsheet. Developed by Origin Ductworks, an American-made and American-owned manufacturer of clamp-together and flange-together industrial ductwork, this app is backed by decades of hands-on experience designing, installing, and troubleshooting dust collection systems. WHAT'S INSIDE • Duct Velocity: Calculate air velocity from airflow and duct size to make sure your system keeps material moving and avoids settling. • Duct Sizing: Find the right duct diameter for your required CFM and target velocity. • Velocity Pressure: Quickly determine velocity pressure for system design and balancing. • Fan HP Estimator: Estimate the horsepower needed to move your airflow against system resistance. • Circumference & Diameter: Convert between circumference and diameter instantly, perfect for measuring existing pipe in the field. • Rect to Round: Convert rectangular duct dimensions to an equivalent round diameter. WHY ORIGIN • Field-tested expertise from a team with over 25 years in industrial ductwork • Simple, installer-focused design with no clutter • Welded and made in Pennsylvania, USA • Knowledgeable support when you need it From woodshops and grain handling to blast applications and heavy-duty custom systems, Origin Ductworks builds duct for the toughest jobs, and now the tools to design them. Need ductwork for your next project? Visit originduct.com or call 833.467.3163.