Features include 2D and 3D ductwork drafting, ductwork sizing, pressure drop calculations, and building load calculations.

Design Master HVAC v.6 Design Master HVAC is an integrated HVAC building design and drafting program for AutoCAD.XDraft adds input constraints and other features that makes it highly suitable for power users. XDraft - drawing and drafting program v.rc XDraft is a mechanical drawing editor similar to XFig or various Windoze cad programs, but geared towards more precise drawing.