Hello Yorik

Hello Yorik Yes I'll be doing it has suggested. But not only for HVAC, I'd like a general pipe type workbench, such as Natural Gas, Water supply, sanitation, drainage etc, they are similar and I project "dimention" with them all, of cause ones more than others, so what I ask is can I open a general discussing that is global in this matter? This comming weak I'll start the discussion, on the Arch section. Thank's Zef