The is the industry-standard reference for designing and analyzing ductwork systems. It provides the loss coefficients ($C$-values) required to calculate pressure losses for various duct fittings (elbows, transitions, take-offs, etc.).
Enter flow rate and dimensions; get pressure loss instantly. Reliability: Data pulled straight from ASHRAE Handbook—Fundamentals. ashrae duct fitting database excel link
The ASHRAE Duct Fitting Database is the digital version of the classic "SMACNA" and ASHRAE fitting loss coefficient tables. It contains over 1,200 unique fitting types (round, rectangular, flat oval) with parametric equations to calculate based on actual dimensions and flow rates—not just static lookup values. The is the industry-standard reference for designing and
Educational tools available on platforms like MEP Engineer groups allow users to select duct material and size to see immediate effects on pressure drop. Why Precision Matters Educational tools available on platforms like MEP Engineer
Example CSV import: