My neighbour has recently installed a new heating system and has an aluminium chimney on the side of her house. Is there a legal minimum height requirement for these? I'm asking as whenever her heat is turned on our utility room stinks of smoke and we can smell smoke in other parts of the house. I also won't be able to open the window in the downstairs bathroom as the smoke will fill it. Putting the washing on the line will also be a no go.