Current
Core Supplement
Advice on selecting and maintaining chimneys and flues for maximum performance, safety and durability covering designations; types of appliance, chimney and flue system; lining existing chimneys; flue termination positions; notice plates; regulations and standards.
June 2023 edition. Supersedes June 2022 edition.
Part of the Federation of Environmental Trade Associations Ltd, the British Flue & Chimney Manufacturers' Association is the trade association for factory-made chimney products.
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
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