The HVAC ASHRAE Duct Fitting Database (DFDB) for the iPhone and iPad is now a universal app. This means that it works on both the iPhone and iPad and adjusts its screen accordingly. THIS APP IS ALSO COMPATIBLE WITH THE LATEST VERSIONS OF IPHONE AND IPAD (and iOS).

The DFDB app allows you to perform pressure loss calculations for all 240+ 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 application. 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.

What’s New

Version 4.0

This is the biggest update to the ASHRAE Duct Fitting Database app in years! It includes all of the latest updates that have been incorporated into the desktop version over the past 8 years. It includes loads of new fittings (30+), updates to existing fitting calcs, updated reports, and many other new features.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

299494 ,


Not worth the cost.

Ardikhla ,


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.

AirConReseller1001 ,

Useful app with lots of data

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.


8.8 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.



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  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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