HotDawg 75000 btu heater in my basement

I want to use a HotDawg 75000 BTU heater in my basement. I do have a garage area that has no barrier wall separation from the rest of the basement. Any thoughts concerning the safety of this type application would be appreciated. I would also have to run about 35 ft. of horizontal exhaust vent to get outside, unless It's acceptable to exhaust it under a deck, then the run would be about 15 ft. with one elbow. My basement ceiling is not insulated and I want to use this heater to take the chill off the downstairs and keep it about 60 degrees when I'm working down there.