Digiduct vs Easy Duct

The Digiduct app is a powerful tool designed for HVAC professionals, supporting everything from design calculations to real-time field verification. Built utilizing the equations and recommendations from the ASHRAE Fundamentals – Duct Design chapter, it ensures your calculations are accurate and reliable, saving you time and reducing errors. Key Features: • Multiple Shape Sizing Options: Supports sizing for rectangular, round, and flat oval ducts, offering flexibility for various duct designs. • Customizable Dimensions: For rectangular and oval ducts, users can lock in one dimension, and the app calculates the other, ensuring precise results based on CFM, pressure drop due to friction, or velocity. • Duct Location Intelligence: offers the user predefined parameters to use as starting point and reference when selecting duct sizes so users at HVAC experience level can make confident selections. Why Choose Digiduct? Unlike other duct sizing tools, Digiduct goes above and beyond. It doesn’t just provide basic size outputs—it evaluates the location and context of your duct (high-pressure vs. low-pressure, shaft vs. plenum), alerting you if your selection exceeds maximum pressure drop or velocity limits. This added layer of intelligence ensures higher accuracy and gives users confidence that their sizing is optimal for the application. Get the assurance of precision with Digiduct—designed to meet the demands of real-world HVAC scenarios.

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.