We have recently moved into a rented flat and the neighbour has the condensing boiler flue coming out of the wall which is on the boundary and is directed at our window, the end of the flue is about 1.5 metres from our kitchen window. Apart from the noise whilst the boiler is on the gases emitted get blasted out directly into our kitchen window when it's open. The landlord says, 'it's been like it for 10 years and the previous tenant never complained the gases are just water vapour'. We don't want problems with the neighbour or our landlord and have passed a letter via our landlord to the neighbour asking them to fit an elbow to direct the gases upwards which the neighbour is considering. Advice please.