# ASHRAE Duct Fitting Database — 240+ ASHRAE Fittings

> Mobile tool for ASHRAE duct fitting pressure loss calculations and reporting. (iPhone/iPad app by ASHRAE, Inc..)

- Source: https://appshunter.io/ios/app/ashrae-duct-fitting-database/id405131130 (this page in markdown: same URL + `.md`)
- Developer: [ASHRAE, Inc.](https://appshunter.io/developer/375374912)
- Category: Productivity, Business
- Price: $9.99
- Rating: 2.00/5 from 1 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 7 MB
- Languages: English
- Released: 2010-12-17
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ashrae-duct-fitting-database/id405131130/reviews.md

## What is ASHRAE Duct Fitting Database?

The ASHRAE Duct Fitting Database (DFDB) for the iPhone and iPad is now compatible with iOS 16 and iPhone 14 Pro.

The ASHRAE DFDB app allows you to perform pressure loss calculations for all 250+ ASHRAE duct fittings in both IP and SI units. Features include dynamic illustrations of each design, and the ability to share reports and spreadsheets through email.

This app is based upon the popular ASHRAE Duct Fitting Database desktop and web applications. The advantages of this mobile app are that you can easily use it out in the field to do quick duct pressure loss calculations, the inputs can be adjusted by touch, and installation is automatic. 

The following is a partial list of features: 

1. You can create individual projects, each with unique input values and results. 

2. Each fitting has its own custom set of input parameters and results. 

3. You can easily change the minimum and maximum allowable values for all input parameters. 

4. It includes a useful search feature that allows you to type in a partial or full fitting code name to quickly retrieve it. 

5. It allows you to display and email two types of reports. The app reports also include a spreadsheet attachment that you can open on your desktop computer to do further analysis. 

6. The app displays inputs and results in both IP and SI units. 

7. Works on both the iPhone and iPad and adjusts its user interface according to the proper size screen.

The ASHRAE Duct Fitting Database application was designed by Carmel Software Corporation exclusively for ASHRAE.

## Key features

- Pressure loss calculations for 250+ ASHRAE duct fittings
- Support for IP and SI units
- Dynamic illustrations of fittings
- Individual project creation
- Adjustable input parameters
- Searchable fitting database
- Emailable reports with spreadsheet attachments

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/ashrae-duct-fitting-database/id405131130/reviews.md

### 3/5 — Generally ok

*2022-06-01, version 5.9*

A few issues:

Sliders for sizes should default to integer steps. Sliders for CFM should default to 100 cfm steps above 2000 and 25 below. 

SD7-3 returns 0 pressure drop regardless of inputs. Oops.

### 3/5 — Crashes when trying to send a report

*2022-03-07, version 5.9*

The app used to work well.  Today, when trying to send a report, the app crashes every time.

### 1/5 — Waste

*2019-12-13, version 4.0*

Not worth the cost.

### 3/5 — Good but not great

*2013-06-18, version 1.12*

The duct database program is a nice start to what could be an incredibly powerful tool.  Compared to the full cost of getting the fitting database on a CD from ASHRAE, this is a steal!
 
There are some occasional crash issues.  I'm guessing there needs to be some additional error catching for when you are modifying parameters that may be out of bounds.
 
There are three problems I have with this program at this point that need to be addressed before I can give the program a full 5 stars.  I can see this app being useful in a field setting when analyzing existing conditions.  Coming from an engineering and design standpoint, however, there are several improvements that need to be made.
 
First, it is a little difficult to navigate through the different fittings.  The search feature is nice.  What would be great is if you could browse through the different fittings and when tapping on a fitting you can see the diagram of the fitting.  As it is, it is difficult to tell what the fitting is exactly.
 
Second, as it is, all fittings are present in each project.  This should be changed so that you pick a fitting and insert it into your project.  This way it is easy to navigate through the fittings you have modified for the particular project you are working on.  The app should also allow multiple instances of each fitting in each project.  That way you can check multiple instances of fittings when doing design work.
 
Third, adjusting values utilizing the sliders (on the iPad at least) is incredibly sensitive.  I have to touch the sliders perfectly to make them work.  Otherwise the screen wants to slide over to the diagram panel.
 
Some other thoughts and suggestions:
 - Provide for setting project level airflow and duct dimensions.  Each fitting added to the project would then default to these settings and then can be altered as needed.
 - Show a project summary table listing fittings with velocities, Pv, Co, and pressure loss values.
 - Add straight ductwork calculation (easy enough, equations are all in the handbook)
 - Add a button to swap the height and width values.

### 1/5 — Engineer

*2012-06-25, version 1.10*

This expensive app is a great idea that was executed horribly. The program crashes often on certain fittings - so much so that I don't use it anymore.

### 5/5 — Useful app with lots of data

*2012-01-03, version 1.8*

This is a very useful app with lots of coefficient data for almost all of the ASHRAE fittings (230+). I noticed that a couple are missing, but I did talk w/Carmel and they are releasing an update in January 2012 that will include all the remaining fittings, including the ED5's and more. 

I love that I can email the fitting data with picture. Very handy. Look forward to the newest update soon.

### 1/5 — Need to add fittings

*2011-12-23, version 1.8*

This app would be worth the money if they would follow-through and add more fittings.

### 2/5 — No updates...

*2011-12-08, version 1.8*

Still waiting to see these monthly updates with the rest of the missing fittings.

### 2/5 — Need to deliver on promise

*2011-09-30, version 1.8*

The developers of this app indicated they would be issuing updates monthly adding additional fittings.  There hasn't been an update since March.  I bought this app in part because of that stated commitment.  The app itself works well enough.  It is just missing a lot of fittings, which makes its limited in a manner that basically makes it useless to me.  When they actually deliver on what they committed to do, I will upgrade my review.

### 5/5 — Great app

*2011-02-01, version 0*

I've been using the DFDB desktop app for years and it's been a great tool. Now, this DFDB mobile app allows me to do quick fitting pressure loss calcs out in the field, and then email the results back to the office for further analysis. It's amazing that the entire database of 200 or so fittings is in this little app.

Great job!

## Frequently asked questions about ASHRAE Duct Fitting Database

### What is the ASHRAE Duct Fitting Database?

The ASHRAE Duct Fitting Database is a mobile application designed to perform pressure loss calculations for over 250 ASHRAE duct fittings. It supports both IP and SI units and allows users to create projects, adjust inputs, and share reports.

### What devices does the ASHRAE Duct Fitting Database support?

The application is designed to work on iPhone, iPad, and iPod devices. It adjusts its user interface to fit the screen size of the device it is running on.

### How often is the ASHRAE Duct Fitting Database updated?

The app was last updated on February 19, 2023, with version 6.1. This indicates a commitment to maintaining compatibility with the latest operating system versions and potentially adding new features or improvements.

### Can I use the ASHRAE Duct Fitting Database offline?

The description highlights the advantage of using the app in the field for quick calculations, implying it can be used without a constant internet connection. Installation is automatic, and features like project creation and calculations are available locally.

### What kind of reports can I generate with the ASHRAE Duct Fitting Database?

You can display and email two types of reports, which include a spreadsheet attachment. This attachment can be opened on a desktop computer for further analysis of the duct fitting calculations.

### Is the ASHRAE Duct Fitting Database suitable for beginners?

While designed for professionals, the app's features like dynamic illustrations and adjustable inputs can assist users in understanding duct fitting calculations. The search feature also helps in quickly retrieving specific fittings.

### What is the age rating for the ASHRAE Duct Fitting Database?

The application has an age rating of 4+, making it suitable for a wide range of users. This rating typically indicates content that is generally safe for children.

### How does the ASHRAE Duct Fitting Database compare to desktop versions?

This mobile app is based on popular desktop and web applications, offering the advantage of portability for quick field calculations. It provides similar functionality for pressure loss calculations and reporting.

## Version history (last 5 releases)

### 6.1 — 2023-02-19

1. Updates to the following fittings: SR7-2,SR7-3, SR7-14, SR7-15, SR7-16, SR7-17. Added new parameters and updated the calcs
2. If you are updating an previous version of the DFDB app, make sure to close the app then re-open it after downloading the update so it refreshes the list of projects.

### 6.0 — 2022-11-06

1. Updated the minimum coefficient ratio lookup values for the following fittings: SD5-1, SD5-2, SD5-3, SD5-4, SD5-5, SD5-6, SD5-7, SD5-8, SD5-9, SD5-10, SD5-11, SD5-12, SD5-13, SD5-14, SD5-15, SD5-, SD5-16, SD5-17, SD5-21

2. Optimized for iOS 16 and iPhone 14.

### 5.9 — 2021-09-22

1. Fixed issues with the input parameters for the CD6-1, ED1-2, and ED1-3 fittings.

### 5.8 — 2021-09-14

1. Fixed issue with keyboard not appear in Settings form
2. Fixed issue with app not being compatible with Dark Mode

### 5.7 — 2021-09-03

1. Updated the iPhone/iPad user interface to accommodate higher resolution screens on iPhone 12  Pro (iOS 14)

2. Displays more inputs on one screen versus splitting them up on multiple screens due to previously lower-res versions

3. Updated the following fitting calcs: CD11-3, SR2-5, SF4-1, CD3-22, CD3-23, CD9-1, CD9-4, CD11-4, CR3-17, CR9-9 to CR9-14, CF3-1, CF3-6,
CF11-1, ED7-4, ED1-8, EF4-1, EF5-1, EF5-3, ER2-2

4. Changed fitting name sort order for certain fitting categories

5. Updated help

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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 2026-06-10.*