There is nothing to say a flue cannot terminate on shared path or landing.

I thought i`d seen something in the Worcester Bosch install guide about
not fitting it in a shared passageway, and that a boiler with a fanned
flue should have something like 1.5m horizontal seperation.

There may also be height considerations in a shared passageway - it might
be possible for someone to inadvertantly come into contact with the flue.

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