A new housing estate has gone up near me. All are 4 bedroom detached houses with chimnney stacks & chimney pots at both ends of the roof.
4 of these houses have since had wood or multifuel burners put in and they all sport an external black metal flue coming out through the wall from one of the downstairs romms amd then going up more or less parallel externally with the existing chimney and the final metre is adjacent to the chimney stack.Why couldn't they use the the nearly new chimney stack that was built when the house was built instead of having a black pipe going up externally?