Tika
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There is no shutter; I suspect it is a bottom-of-the-range Silavent fan, so it is a mystery why the smell is not evident even when the fan is off. Although it sucks in a tissue held nearby, it has little effect on anything very far away. Having the door open makes no difference either way.
I am not familiar with chimney construction, but would I be correct in thinking that my flue starts from the ground and that other flues start on their respective floors? If so, then it is not possible that our fan has been put on another flat's flue, but is it possible that a fan in another higher up flat accesses our flue? In that case, would a more powerful fan solve our problem?
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