Ashrae Duct Fitting Database 2016 !exclusive! May 2026

ASHRAE Duct Fitting Database (DFDB) 2016 is a technical resource primarily used for calculating pressure losses in HVAC systems. Rather than being a single "paper," it is a comprehensive digital database of loss coefficients for over 200 types of duct fittings , including round, rectangular, and flat oval shapes. Core Functionality Loss Coefficients : It provides empirical loss coefficient ( cap C sub o

1. Elbows
2. Tees
3. Wyes
4. Transitions
5. Dampers
6. Filters
7. Other fittings

Structure of the Database: How Fittings Are Organized

To efficiently use the ASHRAE Duct Fitting Database 2016, you must understand its indexing system. Fittings are grouped into eight major categories (C0 through C7), each with sub-figures. ashrae duct fitting database 2016

Radius Ratio: For elbows, the ratio of the centerline radius to the duct diameter/width. Retrieve Coefficient: The database generates the value based on these inputs. 3. Manual Calculation (Verification) Once you have the coefficient ( ASHRAE Duct Fitting Database (DFDB) 2016 is a

For current projects, use ASHRAE DFDB v6.0 (2020) if possible, but many legacy systems still reference the 2016 coefficients. Always verify the fitting number and reference velocity definition when extracting $C$ values. Structure of the Database: How Fittings Are Organized

to see how commercial software integrates these ASHRAE fitting updates. (e.g., SR3-1) or a PDF summary of the coefficients? Duct Fitting Database - ASHRAE