# Digiduct — Duct-Sizing App

> HVAC duct sizing calculator based on ASHRAE Fundamentals. (iPhone/iPad app by Syska Hennessy Group.)

- Source: https://appshunter.io/ios/app/digiduct/id6738926359 (this page in markdown: same URL + `.md`)
- Developer: [Syska Hennessy Group](https://appshunter.io/developer/1782943081)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.60/5 from 11 App Store ratings
- Age rating: 4+
- Requires: iOS 26.2 · 4 MB
- Languages: American English
- Released: 2024-12-06
- Data updated: 2026-07-20
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/digiduct/id6738926359/reviews.md

## What is Digiduct?

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.

## Key features

- Duct sizing for rectangular, round, and flat oval ducts
- Customizable dimensions with locked values
- Duct location intelligence for context-aware sizing
- Calculations based on CFM, pressure drop, or velocity
- Alerts for exceeding pressure drop or velocity limits


## Frequently asked questions about Digiduct

### What is Digiduct?

Digiduct is a utility app designed for HVAC professionals to perform accurate duct sizing calculations. It utilizes equations and recommendations from the ASHRAE Fundamentals – Duct Design chapter to ensure reliable results.

### What duct shapes does Digiduct support?

Digiduct supports sizing for rectangular, round, and flat oval ducts, providing flexibility for various duct designs.

### How does Digiduct ensure calculation accuracy?

The app calculates duct sizes based on CFM, pressure drop due to friction, or velocity. It also evaluates duct location context (high-pressure vs. low-pressure, shaft vs. plenum) and alerts users if selections exceed maximum pressure drop or velocity limits.

### What devices is Digiduct available on?

Digiduct is available on iPhone, iPad, and iPod devices.

### How often is Digiduct updated?

The latest version of Digiduct is 1.0.6, and it was last updated on August 14, 2025. Updates typically occur to improve functionality and reliability.

### What is the age rating for Digiduct?

Digiduct has an age rating of 4+, making it suitable for a wide range of users.

### Does Digiduct have ads?

Yes, Digiduct contains advertisements.

### What is the user sentiment for Digiduct?

Digiduct has received excellent user feedback, holding a rating of 5.0 stars from 10 ratings.

## Version history (last 5 releases)

### 2.0.0 — 2026-07-09

- New Native UI Design
- Instant Calculations
- Fixed Email export bug
- Fixed Round Calc Crash Issue

### 1.0.6 — 2025-08-14

- Added a Clear/Reset Button
- Customizable Location Conditions
- Customizable Roughness Factor
- Bug Fixes

### 1.0.5 — 2025-04-04

- New Name!
- Bug Fixes - Text Box Color correctly updating when removing duct size measurements
- UI Improvements
- Improved Performance

### 1.0.4 — 2025-03-11

1.0.4

- Fixed SI Rounding Bug
- Fixed Duct Location Red Indicator Bug
- Improved Performance

### 1.03 — 2025-03-06

1.0.3

- Velocity and Friction Update as duct sizes are chosen
- Duct Location red font shows on final results instead of initial results
- Improved performance
- Improved Responsive styling
- Several Bug fixes

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## Related topics

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-20.*