Current
Core Supplement
Technical Specification
Enhanced security and general requirements for letter plate assemblies and slide through boxes designed for fire and/or non-fire applications.
Supersedes the 2015 edition. DHF 1112 TS008/05/22.
The Door and Hardware Federation (DHF) was created from a merger of the Association of Builders' Hardware Manufacturers (ABHM) and the Door and Shutter Manufacturers' Association (DSMA) as a not-for-profit trade association for companies associated with locks and building hardware, doorsets, industrial doors and shutters, domestic garage doors and automated gates. They provide technical advice, training, knowledge and practical help.
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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