Insulation is blown in the attic and heater is below when the vent chutes run. With the pitch of the roof and how close it would be to the edge of the roof there is not much room to work while in the attic. It's not impossible, but also would pose challenges. I also would prefer to not have to...
I am in the process of installing a MHU 50 in my garage. It's hard to visualize without the heater mounted so I will try to explain it the best I can and try and answer any questions. I plan to mount in the corner up against the ceiling. The vent outlet will be close to the ceiling, but still...