# ASHRAE HVAC Duct Sizer — HVAC Duct Sizing and more....

> HVAC duct sizing calculator using the constant friction method. (iPhone/iPad app by ASHRAE, Inc..)

- Source: https://appshunter.io/ios/app/ashrae-hvac-duct-sizer/id1273371824 (this page in markdown: same URL + `.md`)
- Developer: [ASHRAE, Inc.](https://appshunter.io/developer/375374912)
- Category: Business, Productivity
- Price: $5.99
- Age rating: 4+
- Requires: iOS 12.0 · 16 MB
- Languages: American English
- Released: 2017-09-14
- Data updated: 2026-08-20
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ashrae-hvac-duct-sizer/id1273371824/reviews.md

## What is ASHRAE HVAC Duct Sizer?

The ASHRAE HVAC Duct Sizer application allows you to quickly size one HVAC duct run or a range of duct sizes using the constant friction method. Think of this application as a digital version of the classic Trane Ductulator.
 
In the "Size by Airflow" mode, you can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss.
 
In the "Size by Dimensions" mode, you can analyze an existing duct system. There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss.
 
In the "Range of Duct Sizes" mode, you can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds.
 
You can specify additional parameters such as the duct shape (rectangular, round, or oval), the air temperature and the air pressure. You can also choose to display values in either English (IP) or Metric (SI) units.
 
This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results.
 
This app now works on your iPhone and iPad and adjusts its screen size accordingly.
 
Finally, you can email all of the inputs and results from all 3 input modes to perform further analysis using your desktop computer. The email includes HTML text and a .CSV attachment that can be imported into any popular spreadsheet.
 
The ASHRAE HVAC Duct Sizer application was designed by Carmel Software Corporation for ASHRAE.

## Key features

- Constant friction method duct sizing
- Size by airflow or dimensions
- Range of duct sizes calculation
- Supports rectangular, round, oval ducts
- Adjustable air temperature and pressure
- English and Metric unit display
- Email results with CSV attachment

## Chart rankings

- #85 in Top Paid · Business (US App Store)

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/ashrae-hvac-duct-sizer/id1273371824/reviews.md

### 1/5 — Do not get

*2020-02-17*

Junk

### 1/5 — Rubbish

*2018-10-14*

Not worth a penny
Clunky user interface, duct size rounding only to mm. Needs to have commercially available duct sizes,

### 1/5 — Not Worth It

*2018-10-11*

Check out Ductulate HD

## Frequently asked questions about ASHRAE HVAC Duct Sizer

### What is the ASHRAE HVAC Duct Sizer app?

The ASHRAE HVAC Duct Sizer app is a tool for calculating HVAC duct sizes using the constant friction method. It allows users to determine duct dimensions based on airflow, velocity, or friction loss.

### What modes does ASHRAE HVAC Duct Sizer offer?

It offers three main modes: 'Size by Airflow' to calculate dimensions from airflow, 'Size by Dimensions' to analyze existing ducts, and 'Range of Duct Sizes' to find sizes within specific friction loss and airflow values.

### Can I use ASHRAE HVAC Duct Sizer for different duct shapes?

Yes, the app supports rectangular, round, and oval duct shapes. You can also specify air temperature and pressure for more accurate calculations.

### Does ASHRAE HVAC Duct Sizer support different units?

Yes, you can choose to display all values in either English (IP) or Metric (SI) units, making it versatile for international use.

### How can I share my calculations from ASHRAE HVAC Duct Sizer?

You can email all inputs and results directly from the app. The email includes both HTML text and a .CSV attachment for easy import into spreadsheet software.

### What devices is ASHRAE HVAC Duct Sizer available on?

The app is available for iPhone, iPad, and iPod touch, and it adjusts its screen size accordingly for optimal viewing on each device.

### How much does ASHRAE HVAC Duct Sizer cost?

ASHRAE HVAC Duct Sizer is a paid application, priced at $5.99. It does not feature in-app purchases or advertisements.

### When was ASHRAE HVAC Duct Sizer last updated?

The app was last updated on February 17, 2023, indicating ongoing support and potential for future improvements.

## Version history (last 5 releases)

### 6.2 — 2023-02-17

Updated help and images

### 5.6 — 2021-10-10

1. Optimized for iOS 15
2. Fixed issue with duct shape selector control text being cutoff
3. Updated help

### 5.5 — 2020-08-17

1. Updated the app launch screen per new Apple iOS guidelines.
2. Updated Google Analytics and Crashlytics

### 5.0 — 2019-12-18

1. Fixed the "negative sign" issue that occurs in iOS 13
2. Fixed issue with not displaying properly in iOS 13 "dark mode"
3. Optimized the user interface for iOS 13 and iPhone X and 11 screens
4. Updated help

### 1.5 — 2018-01-31

1. Updated ASHRAE logo
2. Updated for iOS 11

## Apps similar to ASHRAE HVAC Duct Sizer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [TrueFlow HVAC Air Flow](https://appshunter.io/ios/app/trueflow-hvac-air-flow/id1518628173) | 5.0 (4) | Free | Business |
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| [ACCA 365](https://appshunter.io/ios/app/acca-365/id1541204865) | — | Free | Business |
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## More apps by ASHRAE, Inc.

- [HVAC ASHRAE 62.1](https://appshunter.io/ios/app/hvac-ashrae-621/id375374905)
- [ASHRAE Duct Fitting Database](https://appshunter.io/ios/app/ashrae-duct-fitting-database/id405131130)
- [ASHRAE Psychrometric Chart](https://appshunter.io/ios/app/ashrae-psychrometric-chart/id584295008)
- [High Performing Buildings](https://appshunter.io/ios/app/high-performing-buildings/id957515406)
- [ASHRAE HVAC PT Chart](https://appshunter.io/ios/app/ashrae-hvac-pt-chart/id1273373336)

All apps by ASHRAE, Inc.: https://appshunter.io/developer/375374912

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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 2026-08-20.*