I have a bathroom where the only option to place the door is close to the chimney. There's no room for repositioning. The chimney is in use, but the flue where the door will be is not used. Does the rule that it should be 100mm away from combustible material still apply then? The flues in use are on the other side of the chimney and thus about 30 cm from where the frame will be. I can't find information about my specific case through Google. Can anyone refer to a source? In the image I've attached, the flue in use is marked in red. I can add that the flue is used for recreational fires and not primarily for heating.
