SDUCT is a powerful utility for drawing ventilation ducts rapidly in AutoCAD.
SDUCT is a powerful utility for drawing ventilation ducts rapidly in AutoCAD庐. Standardization has never been so easy. Moreover, technical drafters save a lot of their precious time.

Provides:
elbows
accessories
symbols
dimensions
Acoustic insulation
thermal insulation
flexible conduits
and more

Includes:
automatic over and under trim
automatic air flow detection
customization
exportable options you can free download SDUCT 2009 1.20 now.