Started on the intake holes with a titanium bit then the hole punch. Fortunately I started with a 3/4" punch but found out afterwards that it doesn't make a 3/4" hole. It's a bit oversized, almost 7/8". This greenline punch is made for electricians I believe (holes in panels, etc) and I suspect the 3/4" is made to fit the connectors that fit on the end of 3/4" conduit, hence why they are a little oversized.
So ordered a step bit to drill out to 1". Hopefully someone will avoid the mistake I almost made with this bit of info.