by Brianna Crandall — July 13, 2015—BSI, the business standards company, has revised BS 7273-4:2015 Code of Practice for the operation of fire protection measures – Part 4: Actuation of release mechanisms for doors. It was developed using collaborative input from the fire and safety industry, with such organizations as The Fire Industry Association (FIA), Fire Protection Association (FPA), Chartered Institution of Building Services Engineers (CIBSE), Royal Institution of Chartered Surveyors (RICS), and National Landlords Association (NLA) offering guidance.
Fire doors are typically designed to be kept closed at all times so that fire and heat are contained and their spread minimized, explains BSI. This is achieved through use of well-engineered fire doors. However, on occasion they may be held open to facilitate convenience and/or accessibility around a building, and in this situation mechanisms to hold them open should follow BS 7273-4. This standard relates to the engineering of fire alarm systems and in particular mechanisms to interface with fire doors and secured fire exits. It addresses safety critical arrangements that enforcing authorities rely on to ensure a building can be evacuated safely—where fire doors are held open or exits secured that need to be released by the fire alarm system.
It is vital that there is a common approach to fire alarm design with regard to these interfaces, says BSI, especially as there is a responsibility for key stakeholders to meet relevant fire safety legislation. Previously, a device local to the doors effectively switched the doors to fail safe mode and released electrically secured fire exits and closed fire doors held open on magnetic door retainers. However, this is not always the case, and a truly fail-safe mode is not achieved. Therefore in some circumstances fire doors fail to satisfy enforcers that recommendations of BS 7273-4 are being met. As such, BS 7273-4:2015 will help to clarify the expectations of users and match it to the technology available to the fire alarm industry, explains BSI.
Key changes to BS 7273-4:
- Text has been shortened and simplified to make the standard more straightforward to use. Some of the commentary has been moved to new informative annexes and some of the previous text has been tabulated.
- The diagrams relating to the location of smoke detectors in relation to electrically held-open fire doors have been revised. This is intended to make the recommendations clearer and to remove possible confusion where a single diagram has been used to convey several principles applying to detector siting and spacing
- There have been changes in terminology to assist users of the standard. The designations, A, B and C for categories of actuation are now referred to as “Critical,” “Standard” and “Indirect,” each of which has a set of criteria for fail-safe operation under defined conditions.
- The guidance in BS 7273-4:2007, Annex A of the previous standard is now normative and, therefore, the standard includes recommendations (in tables in Annex B of this version) as to which category of actuation is appropriate for a particular application.
BS 7273-4:2015 is of interest to fire alarm manufacturers and installers, enforcing authorities including building control bodies, and fire and rescue authorities, fire consultants and fire risk assessors, as well as facilities managers and building owners and tenants who specify and operate the doors.
