HVAC Lisp commands in metric

[Airforce2]

Does anyone know of any good metric lisp routines for the following;

Flexible connections
Flexible ducting
Ductwork

I draft up my own designs and would like to speed up the drafting process where possible.

I need to have it all in metric if possible.

Thanks.

 

[Airforce2]

Oh, I should clarify that I only need this in 2D.

Thanks again