# ASHRAE DFDB Lite — ASHRAE Duct Fitting Database

> Duct fitting pressure loss calculator for HVAC engineers. (iPhone/iPad app by ASHRAE, Inc..)

- Source: https://appshunter.io/ios/app/ashrae-dfdb-lite/id6475053772 (this page in markdown: same URL + `.md`)
- Developer: [ASHRAE, Inc.](https://appshunter.io/developer/375374912)
- Category: Business, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 7 MB
- Languages: English
- Released: 2024-08-01
- Data updated: 2026-07-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ashrae-dfdb-lite/id6475053772/reviews.md

## What is ASHRAE DFDB Lite?

The ASHRAE Duct Fitting Database Lite app is a free app that allows you to perform pressure loss calculations for a subset of the 240+ supply, common, and return/exhaust ASHRAE fittings listed in the 2021 ASHRAE Handbook—Fundamentals. These include the following:

SD2-1
SD5-9
SR2-1
SR5-5
SF4-1
CD3-1
CD11-1
CR6-1
CR9-1
CR11-1
ED1-1
ED4-1
ER1-1
ER4-1

The following is a partial list of features of this app:

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. The app includes a search feature that allows you to type in a partial or full fitting code name to quickly retrieve it.
5. You can display and email two types of reports. 
6. The reports include a spreadsheet attachment that you can open on your desktop computer to conduct further analysis.
7. Inputs and results are displayed in both I-P and SI units.
8. The app works on both the iPhone and iPad and adjusts its user interface according to the device screen size.

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

## Key features

- Pressure loss calculations for ASHRAE fittings
- Individual project creation
- Customizable input parameters
- Fitting code search feature
- Display and email reports
- I-P and SI unit support
- iPhone and iPad compatible

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/ashrae-dfdb-lite/id6475053772/reviews.md

### 1/5 — No Content

*2025-12-11*

This app is essentially useless because it contains less than 5% of the total ASHRAE fittings. I'm not really sure who this is intended to be useful for, as it certainly isn't enough content for any real engineering project. It really feels like it's supposed to be frustrating just to push you toward ASHRAE's paid options, which are woefully overpriced. Really frustrating business tactics by ASHRAE on their duct database. Since they removed this information from their hardback books, it's not essentially an add-on for information that used to be included.

## Frequently asked questions about ASHRAE DFDB Lite

### What is ASHRAE DFDB Lite?

ASHRAE DFDB Lite is a free application designed to help users perform pressure loss calculations for a subset of ASHRAE duct fittings. It allows for project creation, input customization, and report generation.

### What fittings are included in ASHRAE DFDB Lite?

The Lite version includes a selection of fittings such as SD2-1, SD5-9, SR2-1, SR5-5, SF4-1, CD3-1, CD11-1, CR6-1, CR9-1, CR11-1, ED1-1, ED4-1, ER1-1, and ER4-1.

### Can I create multiple projects in ASHRAE DFDB Lite?

Yes, you can create individual projects, each with its own unique input values and results. This allows for organized calculations for different scenarios or systems.

### Does ASHRAE DFDB Lite support different unit systems?

Yes, the app displays and allows inputs and results in both I-P (Imperial) and SI (International System of Units) formats, catering to a global user base.

### Can I export my calculations from ASHRAE DFDB Lite?

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.

### What devices is ASHRAE DFDB Lite compatible with?

ASHRAE DFDB Lite works on both the iPhone and iPad, adjusting its user interface according to the device's screen size for an optimal experience.

### How often is ASHRAE DFDB Lite updated?

The latest version is 6.80, and the app was last updated on September 10, 2024. This indicates a recent update, suggesting ongoing support and potential improvements.

### Does ASHRAE DFDB Lite have ads?

No, ASHRAE DFDB Lite is a free application and does not contain advertisements, providing an uninterrupted user experience.

## Version history (last 2 releases)

### 6.80 — 2024-09-10

1. Updated the Description text
2. Updated the launch icon

### 6.79 — 2024-08-01

No release notes.

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## More apps by ASHRAE, Inc.

- [HVAC ASHRAE 62.1](https://appshunter.io/ios/app/hvac-ashrae-621/id375374905)
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All apps by ASHRAE, Inc.: https://appshunter.io/developer/375374912

## Related topics

[ashrae dfdb lite](https://appshunter.io/ios/topics/ashrae-dfdb-lite) · [ashrae](https://appshunter.io/ios/topics/ashrae) · [ashrae 365](https://appshunter.io/ios/topics/ashrae-365)

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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 2026-07-18.*