Gerber units and format

Seeed Services Fusion PCB/ PCBA Services
#1

Hi,

This is my first time ordering from Seeedstudio. I’m using altium designer.
Which gerber units(mm or inches) and which format (4:3, etc) should I choose. It isn’t specified anywhere…

Thanks for help

#2

Have you checked the Guideline?
It have specification and Gerber generator for Altium Designer.
http://support.seeedstudio.com/knowledgebase/articles/422482-fusion-pcb-order-submission-guidelines