The official ASHRAE database contains over 2,000 fittings. Free versions typically have less than 200. For commercial projects requiring SMACNA compliance, pay for the real database.
Keep your heating/cooling loads and duct static pressure calculations in one project file.
For engineers seeking the underlying testing methodology, ASHRAE Standard 120-2017 establishes uniform methods for laboratory testing of HVAC ducts and fittings to determine their resistance to airflow. This standard supersedes ANSI/ASHRAE Standard 120-2008 and is updated on a five-year cycle. Compliance with this standard ensures that loss coefficient data is consistent and reliable across different applications. ashrae duct fitting database excel link
After extensive research (and filtering out spam sites promising “cracked” files), here is the truth about the :
Accurate pressure drop calculations are the backbone of efficient HVAC design. Oversized fans waste energy, while undersized fans fail to deliver required airflow, leading to poor indoor air quality and comfort complaints. The official ASHRAE database contains over 2,000 fittings
ΔP=Co×Pvcap delta cap P equals cap C sub o cross cap P sub v Cocap C sub o
: This is a robust, free .xlsm tool from Titus that includes a dropdown menu for ASHRAE fitting codes and calculates pressure loss directly within Excel. Keep your heating/cooling loads and duct static pressure
In your final column, multiply your looked-up loss coefficient by your calculated velocity pressure: =[@Loss_Coefficient] * [@Velocity_Pressure] Use code with caution. Best Practices for HVAC Excel Sheets
The ASHRAE Duct Fitting Database is a comprehensive repository of aerodynamic loss coefficients (loss factors or -factors) for a vast array of duct fittings. Why Fitting Coefficients Matter
Several commercial HVAC software suites offer direct Excel add-ins. These tools embed the ASHRAE database into the Excel ribbon, allowing users to pull real-time fitting data without leaving the spreadsheet. Setting Up an Automated Calculation Sheet
The ASHRAE Duct Fitting Database is a specialized software application and cloud-based platform that provides pressure loss data for over 200 types of duct fittings in round, rectangular, and flat oval configurations. Unlike manual lookups in the ASHRAE Handbook, the DFDB offers dynamic calculation capabilities, allowing users to input flow rates and fitting dimensions to instantly obtain loss coefficients and associated pressure losses.