Duct draw

[shahedwail]

I have a problem when I draw duct the size of draw bigger than the architecture drawing i need help even I have set up the scale of dwg.

[Keith.Brown]

What do you mean by setting up the scale of the drawing?  In AutoCAD MEP (and probably any other cad program) you draw at a 1:1 scale.  You then set up your layout tabs and viewports to display that information at a specific scale.

Another issue is that you might have a metric drawing but a standard measurement catalog part or vice versa.