The ASHRAE Duct Fitting Database (DFDB) version 6.00.05 is a professional software tool used to calculate pressure losses in HVAC duct systems. While the full version is a paid, subscription-based product, a limited "Lite" version is available as a free download. Product Overview and Availability
The software provides design engineers with loss coefficient data for over 200 types of duct fittings (round, rectangular, and flat oval).
Full Version (6.00.05): This version requires an annual subscription for cloud-based access via the ASHRAE Bookstore. It features real-time calculation updates and the ability to save data into project files.
Lite Version (Free): A free mobile application, Duct Fitting Database Lite, is available on the Apple App Store for iPhone and iPad. It includes a subset of approximately 14 common supply, return, and exhaust fittings for quick field calculations. Technical Capabilities
The database is grounded in ASHRAE Standard 120, which establishes uniform methods for testing HVAC duct resistance. Key features of the current 6.0 series include:
Comprehensive Library: Data for over 200 fittings categorized by duct function (supply, exhaust, common).
Calculations: Users input flow rates and dimensions to receive loss coefficients and associated pressure losses in both I-P and SI units.
Integration: Project files can be stored, transferred, and potentially linked to other duct design programs. Usage and Compliance
ASHRAE maintains strict copyright protection over its databases and standards. Official access is only granted through the ASHRAE Technology Portal or authorized bookstore purchases. While some third-party sites may claim to offer "free downloads" of the full version, these are often unauthorized and may pose security risks. Professionals are encouraged to use official channels to ensure data accuracy and software reliability.
To assist with your paper, would you like more information on:
Specific fitting types included in the Lite vs. Full version?
Detailed pressure loss calculation formulas used by the database? ashrae duct fitting database 6.00 05 free download
Comparison between DFDB data and other HVAC standards (like CIBSE)? Duct Fitting Database - ASHRAE
The ASHRAE Duct Fitting Database version 6.00.05 is a professional software tool used by design engineers to calculate pressure losses and loss coefficients for over 200 types of duct fittings
. While a "lite" version is available for free, the full version 6.00.05 is typically a paid product available via subscription. Software Overview & Availability Version 6.00.05 Access
: This version is primarily accessible through a one-year cloud-based subscription from Free Lite Version : ASHRAE offers a Duct Fitting Database Lite iPhone and iPad
at no cost. It allows for calculations on a limited subset of 14 fittings rather than the full library. Third-Party "Free" Downloads
: Various sites may claim to offer "free full downloads" or PDFs of the database (e.g.,
or unofficial Google Drive links). Users should exercise caution as these may be incomplete documents, older versions like 5.0, or unauthorized software. Key Features of Version 6.00.05 Duct Fitting Database - ASHRAE
Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. ASHRAE Duct Fitting Database 6.00.05 | PDF - Scribd
Mastering Your HVAC Design: A Guide to the ASHRAE Duct Fitting Database 6.00.05
Efficient duct design is the backbone of any high-performing HVAC system. To achieve this, engineers rely on the ASHRAE Duct Fitting Database (DFDB)
, a specialized tool for calculating pressure loss and loss coefficients across hundreds of fitting types. If you are looking for information on Version 6.00.05 The ASHRAE Duct Fitting Database (DFDB) version 6
, here is what you need to know about its features, availability, and how to access it. What’s New in Version 6.00.05?
This specific version is part of the 6.0 series, which transitioned from traditional CD-ROM delivery to cloud-based access . Key highlights include: Massive Library: Access to loss coefficient tables for over 200-240 duct fittings , including round, rectangular, and flat oval designs. Real-Time Calculations:
The interface allows you to enter flow rates and fitting details to see pressure loss results update instantly. Project Management:
Engineers can save fittings into individual project files, making it easy to store and transfer specific system designs. Universal Units: Supports both I-P (Inch-Pound) SI (International System) units for global application. Is There a Free Download? While the full Version 6.00.05 is a paid, single-user product provided via a one-year subscription from ASHRAE
, there are free alternatives for those needing quick calculations: ASHRAE DFDB Lite App: free mobile app available on the Apple App Store
. It includes a subset of the most common supply, return, and exhaust fittings (about 14-15 types) for field use. Trial Versions: Some software hosting sites like Software Informer
list older trial versions, though these may not include the full 6.00.05 feature set. Why Use the Full Version? For professional design and External Static Pressure (ESP) calculations
, the lite version may not be enough. The full database is essential for: Accurate Sizing:
Ensuring fans and AHUs are correctly sized based on the critical path of the ductwork. Compliance:
Meeting rigorous ASHRAE standards for energy efficiency and airflow. Seamless Integration:
High-level project reporting that can be emailed or exported for further analysis. Quick example (worked) Given: 12 in (0
Whether you are a veteran design engineer or a student, having the right data at your fingertips is crucial. While the full 6.00.05 database requires a subscription, the DFDB Lite App is an excellent starting point for on-the-go calculations. included in the database or how to calculate external static pressure AI responses may include mistakes. Learn more Duct Fitting Database Lite App - ASHRAE
Given: 12 in (0.3048 m) round duct, air velocity 6 m/s, elbow K = 0.6, ρ = 1.2 kg/m3.
Compute dynamic pressure q = 0.5·ρ·V^2 = 0.5·1.2·6^2 = 21.6 Pa.
Fitting loss ΔP = K·q = 0.6·21.6 = 12.96 Pa (≈0.052 in. wg).
ASHRAE_DB_6_00_05.mdb). Advanced users can connect to it via ODBC.The ASHRAE Duct Fitting Database is a digital repository that codifies the loss coefficients (often denoted as "C" or "C") for thousands of duct fittings. It is the digital companion to the ASHRAE Handbook—specifically the 2009, 2013, 2017, and 2021 ASHRAE Handbook—Fundamentals, Chapter 34 (Duct Design).
Before this database, engineers spent hours manually interpolating charts and tables. The database automates this, allowing users to:
You might wonder why no one simply buys the new version. The answer is integration and workflow. Many internal company Excel tools and legacy AutoCAD scripts were written specifically to interface with the file structure of version 6.00.05. Upgrading to version 8.0 or the cloud version would require rewriting thousands of lines of VBA code.
Furthermore, version 6.00.05 does not require an internet connection. For engineers working on military bases, off-shore projects, or rural data centers, cloud-based subscription software is a liability. A one-time, offline license is superior.
While version 6.00.05 is excellent, you should know about its successors:
pandas-ashrae: An open-source project that has parsed the CSV outputs of v6.00.05 to create a programmable fitting database.Recommendation: Keep version 6.00.05 for quick, offline lookups. Use version 8.0 only if you need BIM integration.
The ASHRAE Duct Fitting Database is a technical resource that provides loss coefficients, equivalent lengths, and related data for common duct fittings used in HVAC airflow calculations. Version numbers like "6.00.05" indicate specific releases/updates to the dataset and/or accompanying software utilities used by engineers and designers to size ductwork and estimate pressure losses.
Because version 6.00.05 is an older build, many firms have upgraded to newer versions and are legally allowed to sell their old physical license keys (dongles). Check eBay, Craigslist, or HVAC engineering forums. Look for the original CD-ROM and the USB hardware key. Crucial note: Ensure the seller transfers the license registration officially to avoid "blacklisting."