What is BS 7346-8?

BS 7346-8 is a British Standard that provides guidance on the installation, commissioning, testing, maintenance, and ongoing operation of smoke ventilation systems.

While standards like BS EN 12101 focus on the testing of individual products such as AOVs and smoke dampers, BS 7346-8 focuses more on how the complete smoke ventilation system is installed, handed over, and maintained throughout its life.

It is the guidance used to help ensure a smoke ventilation system not only meets regulations on paper, but also operates correctly in real-world conditions during a fire.It is not a legal requirement on its own but is widely followed across the industry to demonstrate that a system has been designed and installed correctly.

What does BS 7346-8 Cover?

While standards like BS EN 12101 focus on individual products (like AOVs or Dampers), BS 7346-8 looks at the whole system. It includes guidance on:

System Design

BS 7346-8 includes guidance on making sure smoke ventilation systems are designed correctly for the building and that all components work together as intended.

Approved Document B and BS 9991/9999 may determine whether a building needs a stairwell AOV, smoke shaft, or mechanical smoke ventilation system. BS 7346-8 focuses more on whether the chosen system has been designed correctly so all the components work together properly once installed.

Installation

Even a well-designed smoke ventilation system can fail if it is installed incorrectly.

BS 7346-8 provides guidance around installation practices to help ensure vents, controls, dampers, and power supplies are fitted correctly and operate as intended once installed on site.

Commissioning and testing

Before a smoke ventilation system is handed over, it should be properly commissioned and tested.

This helps confirm the system responds correctly during a fire situation and that all components communicate and operate together correctly.

Typical testing may include:

• Cause and effect testing
• Vent operation checks
• Smoke detector integration
• Battery backup testing
• Manual override testing

Maintenance & Servicing

Smoke ventilation systems are life safety systems and should be maintained regularly to help ensure reliable operation throughout the life of the building.

BS 7346-8 includes guidance around ongoing inspection, servicing, fault identification, and planned maintenance of smoke ventilation systems.

Handover and documentation

Once installed and commissioned, the system should be handed over with the correct documentation and operating information.

This may include:

• System descriptions
• Cause and effect information
• Maintenance requirements
• Test records
• Operating manuals
• As-fitted drawings

Clear documentation helps building owners and maintenance teams understand how the smoke ventilation system operates and how it should be maintained moving forward.

Why is BS 7346-8 Important?

Smoke ventilation systems are designed to protect escape routes and help manage smoke during a fire.

BS 7346-8 is important because it focuses on making sure the full system works together correctly, not just the individual products.

This helps ensure:

• Smoke vents open when needed
• Dampers operate correctly
• Backup power supplies function during a power failure
• Control panels communicate properly
• The system performs reliably during an emergency

Without proper installation, commissioning, and maintenance, even certified products may not operate correctly as part of the wider smoke ventilation system..

Where is BS 7346-8 used?

BS 7346-8 is commonly referenced on projects where smoke ventilation systems form part of the fire strategy, including:

• Apartment blocks
• Stairwell smoke ventilation systems
• Corridor ventilation systems
• Smoke shaft systems
• Commercial smoke ventilation projects

It is widely used by fire engineers, consultants, contractors, commissioning teams, and maintenance providers involved in smoke ventilation systems.