The factory exhaust on my JD 870 is upright, and has a curved end at the top so the opening is vertical, pointing off to the side. There's also a small drain hole about half way down and what appears to be some sort of diverter inside to direct any water that does get in out the drain.
It's worked fine for over 20 years, though I generally don't keep it outside. With nothing but the rounded top of the curved end at the top it sheds small limbs pretty well, though like Lou I generally slow through them since I need to deflect them away from me as soon as they come loose from the exhaust.
It's worked fine for over 20 years, though I generally don't keep it outside. With nothing but the rounded top of the curved end at the top it sheds small limbs pretty well, though like Lou I generally slow through them since I need to deflect them away from me as soon as they come loose from the exhaust.