For HVAC engineers and designers, the (often remembered under the legacy McQuay brand, now part of Daikin Applied) has long been a staple freeware tool. Its primary function is simple but critical: to size ductwork based on friction loss or velocity, and to perform static pressure calculations. However, for professionals who rely on Apple’s macOS, accessing this tool presents a unique set of challenges.
Daikin’s modern replacement. Works in Safari or Chrome. Includes duct sizing, pipe sizing, and equipment selection. Requires a free account. The interface is modern but slower than the classic .exe. mcquay duct sizer for mac
