Final line: If you’ve ever muttered “coefficient of local resistance” out loud in public, this is your GOTY.
Here’s an interesting, slightly tongue-in-cheek review of ASHRAE Duct Fitting Database Version 6.0 , written as if by a veteran HVAC engineer who’s seen it all. Finally, a spreadsheet that understands my ductwork existential crisis
Over 1,200 fittings. Elbows, tees, transitions, wyes, boots, and that one weird fitting that looks like a M.C. Escher drawing. Each one includes loss coefficients (dynamic losses, not static—don’t @ me) that actually match ASHRAE’s latest research. Version 6.0 adds more rectangular and spiral fittings, plus better support for AutoCAD/Revit exports. Yes, it’s still an Excel-based interface from 2005, but somehow that makes it feel earnest .
ASHRAE Duct Fitting Database v6.0 is the boring hero we deserve. It’s the digital equivalent of a perfectly sealed, well-insulated duct run—efficient, reliable, and utterly invisible to the outside world. If you design commercial HVAC systems, this free download just saved you 47 hours of thumbing through Fundamentals handbooks.
⭐⭐⭐⭐☆ (4.5/5 — loses half a star for making me re-learn what a “radius heel” is)
Get it from the official ASHRAE website (not a random HVAC forum from 2014). Your future self—sitting in a mechanical room at 2 AM, balancing a system—will thank you.