I'm installing an electrical generator that runs on natural gas. The 100% load says it uses 560 ft3/ hr. if I run a line 200ft from where the meter is, what size pipe do I need? There is a 1 1/2" line 40 ft away running to a hvac unit. Can I tap off that?

Is this 1 1/2" measured or is it labeled as 1 1/2"

That's the od