Example Workflow (concise)
By mastering the ASHRAE Duct Fitting Database in Excel, you move beyond guesswork and approximation into the realm of precise, verifiable, and professional duct system design—the hallmark of modern HVAC engineering excellence.
at sea level). Include an altitude and temperature correction factor cell in your Excel sheet if your projects span varying geographic elevations. ashrae duct fitting database excel
The standard velocity pressure formula assumes standard air density (
=INDEX(Coefficient_Matrix, MATCH(User_Ratio_Y, Y_Axis_Range, 1), MATCH(User_Ratio_X, X_Axis_Range, 1)) Use code with caution. Example Workflow (concise) By mastering the ASHRAE Duct
The database includes specialized fittings such as screens, turning vanes, and fan inlet/outlet connections.
The database consists of several sheets: The standard velocity pressure formula assumes standard air
On your main calculation sheet, create a row-by-row layout representing the duct run from the fan to the terminal device. Your columns should include: (e.g., Fan Discharge to Elbow 1) Airflow (CFM): Volume of air flowing through the section.
The DFDB is a specialized tool with key features tailored for HVAC professionals:
For example, fitting represents a S upply, R ectangular, Category 3 (Elbow) fitting. Setting Up Your Excel Data Tables
ΔPdynamic=C⋅(ρ⋅V22)=C⋅Pvcap delta cap P sub d y n a m i c end-sub equals cap C center dot open paren the fraction with numerator rho center dot cap V squared and denominator 2 end-fraction close paren equals cap C center dot cap P sub v Pvcap P sub v is the velocity pressure of the air stream. The