Planning authorities often insist that the architectural integrity of older buildings under renovation, particularly their external appearance, must be maintained. Where this restricts chimney requirements, often the only recourse is to re-utilise the existing chimney location by the installation of new chimney liners.

The installation of new liners enables the chimney to serve modern more efficient combustion equipment. This procedure can also be a cost-effective means of renovating existing chimneys which might otherwise have to be completely rebuilt.

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