Ashrae Duct Fitting Database Excel ((free))

Velocity=CFMArea (Sq. Ft.)Velocity equals the fraction with numerator CFM and denominator Area (Sq. Ft.) end-fraction

(e.g., ED1-1 for a round smooth radius elbow, SD5-1 for a rectangular mitered elbow). Geometric ratios (e.g., Radius/Diameter , Aspect Ratio , Transition Angle Flow ratios ( for tees and lateral branches). Loss Coefficients ( Cocap C sub o ) mapping to those specific ratios. The Calculation Engine (Logic Formulas)

Includes pictorial outlines and diagrams for each fitting type.

: Access the official database through the ASHRAE Bookstore. ashrae duct fitting database excel

pv=0.5×ρ×V2(SI Units)p sub v equals 0.5 cross rho cross cap V squared space (SI Units) : Air density : Air velocity The ASHRAE database contains thousands of these Cocap C sub o

The sheet where the designer enters project-specific variables: Duct geometry (Round diameter or Rectangular Width

=IF(Velocity_FPM * Hydraulic_Diameter_Ft / Kinematic_Viscosity < 4000, Use_Transition_Coeff, Turbulent_Coeff) Velocity=CFMArea (Sq

ASHRAE updates its fundamentals handbook and database periodically. Clearly label your spreadsheet with the specific version of the ASHRAE database used to build it (e.g., "Based on ASHRAE DFDB Version 6.00.05").

Excel provides mathematical precision, but field installations rarely match ideal drawings. Always include a customizable safety factor field (typically 10% to 15%) to account for poor field routing, alignment issues, and unexpected site conditions.

: Select the longest duct route or the one with the most fittings to determine the maximum pressure drop. Tag Components Geometric ratios (e

Which (e.g., supply tees, exhaust hoods, radius elbows) are most critical to your workflow? Share public link

While ASHRAE offers its official as a cloud-based software subscription, many engineers use Excel as a central hub to organize calculations for External Static Pressure (ESP) and fan sizing . Mastering Duct Static Pressure with ASHRAE Data and Excel

The is a valuable, accessible engineering tool for HVAC system designers. While it lacks automation, its transparency and direct link to the ASHRAE Handbook make it ideal for manual duct design, peer reviews, and low-budget projects. Users should be aware of the need for manual interpolation and version matching to ensure accuracy.