We had a new combi boiler fitted at the end of last week by British Gas. We live on the ground floor of a set of flats. We're on the end, next to a semi detached house. I've just had a polite note dropped through the door from these neighbours asking if the flue can be directed upwards as it currently points out over where they sit in the garden. (I'm not sure if perhaps they might be a bit higher up than our ground level) I've tried to google it, but I seem to get information about having the flue itself adjusted. What I want to know, can I literally attach something to the wall at an angle of 45° in front of the flue to direct the gasses skyward?