Flue pipe at downward angle?

[jg24cv]

I currently have a Quadra Firee Castile and I am considering upgrading to a Mt Vernon. The exhaust outlet on the Mt Vernon is about 4" higher than my Castile. My Castile vents directly through my wall. There is a 45 with about 2-3' of pipe and that's it. The hole in my wall is level with the outlet on my Castile.

My question is, if I upgraded to the Mt Vernon, can I angle the exhaust pipe down to meet the existing hole in my wall? I know going downhill with stove pipe is taboo, but I figured I'd get some opinions being that my run is so short. Let me know you're thoughts.

 

[Bioburner]

Probably wont have normal operating issues But if power goes out the smoke backup could well make you think "why didn't I do it right". Your going to have the stove in place hopefully for many years.

 

[TimfromMA]

Throw a battery backup on that thing to protect you from smoke filling the house during a power failure.