Vaillant plume kit

[Chalked]

Doing a job where the standard flue terminal will be 1200mm to the side of a balcony. It's a new build and I think the residents will think it's a nuisance. Was thinking of fitting a plume kit and extending the flue vertically.
There are balconies on each floor, so would need to extend by 3m. Can't seem to find any maximum lengths .
can anyone point me in the right direction?

thanks.

 

[Chalked]

Looks like I may have found an answer.