Providing the terminal is more than 300 away from the opening of a window eg bottom of the window / builders opening
Tbh I would still use c on that as read notes 1-2
You sure about vaillant as last time I looked it was 1500mm to a window and 600mm to
the edge / builders opening eg side so face on eg flue to window 1500mm vaillant would be
Eg c on the flueing diagram
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