Thanks @brewchief - I was taking a look at the manual here:
https://www.manualslib.com/manual/906849/Mr-Heater-Mhu-50.html?page=6#manual
and see this paragraph which thought the 2' rule applied.
Similar to this, but just a garage heater instead of a water heater - wasn’t sure if there are length considerations where it might cause issues in actually getting out of the vent?
I’m installing a 50k Big Maxx heater in the corner of my garage. Trying to find the best way to vent without being too much of an eyesore. Horizontally through the back wall is right by our patio and I’m worried if I do vertical it’ll have to be extremely tall to meet the “2ft above roof within...