Thanks,..
SDUCT was created specially to reduce maximum clics.
drawing elbows and reducer hurt me each time..
also,..SDUCT comes with few little lisp,..
such as:
DUCTATTACH
DUCTCONNECT
ELLBY
TAPER
SDUCT provide many options of lining, gap,duct accessories, duct fittings length, text, style, leader, layers, colors etc...