Ashrae Duct Fitting Database Excel Link Hot! | 2K 2025 |

Because fitting coefficients vary based on changing aspect ratios and velocity ratios, standard VLOOKUP is rarely enough. Use the more powerful INDEX and MATCH combination, or the newer XLOOKUP , to perform two-dimensional matrix searches on your ASHRAE_Data tab.

VP(Velocity Pressure)=(V4005)2(for I-P units)cap V cap P open paren Velocity Pressure close paren equals open paren the fraction with numerator cap V and denominator 4005 end-fraction close paren squared space open paren for I-P units close paren

) for more than 200 round, rectangular, and flat oval duct fittings. These coefficients are derived from rigorous laboratory testing and historical empirical data. Why Loss Coefficients Matter

Select Get Data > From Database and point to your centralized fitting repository. ashrae duct fitting database excel link

For the official macro-enabled file, you need Excel 2016 or later (Windows). Mac users may need to use a virtual machine or the Access/ODBC method.

Engineers can build reusable master templates. Changing a duct size or flow rate automatically updates the fitting coefficients and total static pressure.

Input values such as height, width, and velocity to see immediate pressure loss updates. Because fitting coefficients vary based on changing aspect

For field work, ASHRAE offers a free mobile application called DFDB Lite, available on the Apple App Store. This app allows users to perform pressure loss calculations for select supply, common, and return/exhaust fittings in both I-P and SI units. Inputs can be adjusted by touch, making it convenient for on-site design adjustments and quick verifications.

Standard ASHRAE equations assume standard air density (

Open Excel, navigate to the tab, and select Get Data > From Text/CSV . Load the data into a master sheet named ASHRAE_Data . Mac users may need to use a virtual

The desktop version of the ASHRAE DFDB often stores its backend data in a structured database format (like Microsoft Access .mdb or an SQL variant). Go to Excel's tab.

values) and then paste them into their custom Excel ESP (External Static Pressure) calculation sheets. HVAC Simplified Sheets: Sites like HVAC Simplified

No database contains every unique architectural fitting. Create a clear protocol in your spreadsheet for overriding or manually inputting custom loss coefficients (e.g., manufacturer-certified proprietary dampers or fire dampers) without breaking the automated ASHRAE link chains. Maximizing Fan Efficiency Through Accurate Data

Automatically update pressure drops when design airflows (CFM or L/s) change during design iterations.