We are just about to have some tilt and slide patio style doors fitted, old fashioned I know, but it'll work best for our situation. The people installing it seem good to me. But one of the installers we got a quote from said they were too tall (2320mm) and were dangerous at full size and wanted to put a window above. Is this true? He even phoned after we told him we had gone with someone else, just to re-warn us. help! Images of falling large windows!