I have 3.1m ceilings and am about to purchase a canopy rangehood with a flue cover that extends to 1180mm that I want to duct through the ceiling as it will be mounted to an internal wall. The problem is that if I mount it say 700mm above the benchtop. I will have a 320mm gap between the ceiling and the end of the extended flue. The manufacturer does not sell additional flue covering as an accessory. Does anyone have any suggestions to solve this problem??