Big Maxx 75k BTU Spec Questions

[swizcore]

First post;
anyhow, I just purchased the Big Maxx 75kBTU Natural gas heater (Big Maxx 75k BTU) for my garage. Before it gets here I'd like to get the gas pipe and venting materials all set. Can anyone tell me the size of the vent outlet on the back of the unit and the gas fitting size on the unit and whether it is a male or female fitting.
Thanks

 

[beetroot72]

Here ya go bro! 4" vent • 1/2" gas

http://www.mrheater.com/upload/newsletter/MHUSpecSheetLR.pdf

 

[Scott]

My 45k install I think also needed a 3" appliance adapter and then a 3"->4" transition too.
http://www.garagejournal.com/forum/showthread.php?t=2655&highlight=heater
I know it looks silly, but I could not find an adapter that could directly go from the heater up to 4".