Which is best for protecting escape routes: a smoke shaft system or a pressurisation system?

Pressurisation is one of the possible solutions to provide smoke ventilation in escape stairs, common lobbies and corridors in residential buildings as required by Approved Document B and is recommended for fire-fighting stairs in buildings taller than 30m (BS 9999 & BS 9991).

Mechanical ventilation is mentioned in ADB, but only with reference to pressurisation. Nevertheless it has become commonly used as an alternative to natural smoke shafts, providing equivalent or improved performance and is a possible solution in BS 9991.

How do you decide which to use? The decision is influenced by legislation and Standards, building configuration, budget and space requirements. There is no universal “right” choice, but there’s certainly a best choice for each individual building.

This whitepaper covers:

  • What these systems do
  • Features and benefits of each system
  • The Legislation and Standards
  • Common potential issues
  • Compensation for buildings with non-compliant layouts: extended travel distances and change of use
  • How to choose which option is best for your project.

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