Easy Duct vs Origin Duct Calculator

Easy Duct is an air duct sizing calculator built by an HVAC engineer for real design work. Enter what you know and get a buildable duct size in seconds, on site or at your desk. Easy Duct solves for whatever is missing: airflow, head loss, velocity or duct size. Set a maximum head loss and a maximum velocity together, and the duct is sized to whichever limit is reached first. The governing limit is always named, so you know exactly why you got that size. SIZE THE WAY YOU DESIGN - Head loss and velocity limits checked at the same time - Rectangular and round duct, with aspect ratio shown for every size - Buildable size steps (½, 1 or 2 in) so results match what gets fabricated - EN 1506 standard sizes for metric round duct - Pick any duct size and see its spare capacity live SAFETY FACTOR AND ADD TO FLOW - Apply a flow safety factor that is built into the design flow - Adding a branch or outlet? Type the extra airflow and it goes straight onto the total CROSS-CHECK: TWO SCENARIOS, ONE DUCT Size a single duct against two sets of conditions, such as normal and peak operation. Link Scenario B to Scenario A by percentage, added value, equal or absolute, and see side-by-side results with the scenario that governs named up front. UNITS YOUR WAY - Switch between IP and SI with one tap - Tap any unit to change it, field by field: a mm duct with L/s or cfm airflow is fine ENGINEERING YOU CAN CHECK - Darcy-Weisbach with your choice of friction model: Colebrook, Haaland or Altshul - Duct wall roughness by material - Air density and viscosity from temperature and altitude - Full results: design flow, velocity, head loss, equivalent diameter, required round size, cross-section, Reynolds number, friction factor and velocity pressure SIMPLE AND FAST - Minimal interface with results that fold away until you need them - Works fully offline - Also available on Windows and Android Easy Duct is for HVAC and mechanical engineers, designers, estimators and students who size ductwork every day and want a quick, reliable answer.

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.