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Automatic Opening Smoke Vents2026-10-14T08:41:57+00:00

AUTOMATIC OPENING VENTS

Automatic Opening Smoke Vents

Smoke vents are generally installed to openings including windows and skylights

This allows for the smoke and hot air to escape quickly and safely. Automatic opening vents are vents that are designed to open automatically as an outcome of a fire being detected. If an automatic detector or manual call point is triggered, the AOV system will initiate the opening of actuators, windows or vents to facilitate ventilation.

The purpose being to remove the smoke allowing people to leave the building safely. The provisional standard that is now available for reference is EN:12101. We recommend that all specialist equipment receives specialist maintenance ensuring an operational solution to fire safety if required. Our fire alarm service agreement does not include for the smoke ventilation system, however this can be provided. Our fire alarm service would include up to the AOV actuators but exclude the mechanical parts of the AOV unit which includes the motors. The Regulatory Reform (Fire Safety) Order 2005 states that maintenance of smoke ventilation systems is the responsibility of the building operators and owners.

The responsible person for the building must ensure that smoke ventilation equipment is maintained to suitability and will meet the needs required for the area being covered by the AOV. The AOV systems should be serviced and tested regularly to ensure correct operation. We recommend that the AOV system should be tested weekly in line with a fire alarm weekly test. BS7246-8 states that the maintenance of smoke ventilation systems requires a minimum of one annual service completed by a qualified and trained technician. Our technician would require a copy of the building’s smoke ventilation strategy.

In terms of a smoke vent, AOV stands for “Automatic Opening Vent”. These are an essential part of a building’s fire safety system, designed to open automatically upon detection of smoke or heat to help clear escape routes and assist firefighters.

Purpose and Function of Automatic Opening Smoke Vents
The primary purpose of an AOV system is life safety.

  • Smoke extraction: By venting hot smoke and toxic gases from the building, AOVs prevent the build-up of smoke in communal areas, corridors, and stairwells, which are critical escape routes. Smoke inhalation is a major cause of fire-related deaths, and AOVs dramatically reduce this risk by improving air quality and visibility for occupants during evacuation.
  • Firefighter access: Clearer conditions enable emergency services to locate the fire quickly and safely, improving their operational efficiency.
  • Slowing fire spread: Venting heat and smoke helps to delay “flashover,” a phenomenon where all combustible materials in a room ignite simultaneously due to intense heat build-up.
  • Property protection: Minimising smoke and heat spread also helps reduce overall damage to the building and its contents.

How Automatic Opening Smoke Vents Work
An AOV system is typically integrated with the building’s fire alarm or smoke detection system.

  • Detection: When smoke or heat is detected by a sensor or a manual call point is activated, a signal is sent to the AOV control panel.
  • Activation: The control panel then commands actuators (motors, usually 24V DC) to open the vent, window, or roof hatch to its full “fire-open” position, generally within 60 seconds.
  • Ventilation: Hot smoke naturally rises and escapes through the AOV (a process known as the “stack effect”), while cooler, fresh air is drawn in at lower levels, creating a smoke-free layer near the floor.
  • Power backup: AOV systems have a secondary power supply (battery backup) to ensure they operate even if the main power is cut during a fire.

Enquiry

Frequently Asked Questions About Automatic Opening Smoke Vents

An automatic opening smoke vent, commonly known as an AOV, forms part of a building’s smoke ventilation system.

When the system receives an appropriate fire or smoke detection signal, it opens designated windows, roof vents or louvres to help manage smoke and heat.

AOVs can help protect escape routes, support evacuation and improve conditions for firefighters, depending on the building’s smoke control strategy.

The system must operate according to the building’s design requirements to provide its intended level of protection.

An automatic opening smoke vent system uses detection equipment, a control panel and powered actuators to open designated vents when a fire occurs.

The system typically follows these stages:

  • Detection: Smoke detectors or other specified devices identify a fire condition.
  • Control: The smoke control panel receives the signal and initiates the programmed response.
  • Activation: Actuators open the appropriate windows, roof vents or louvres.
  • Ventilation: Smoke and hot gases move through the designated openings according to the smoke control design.
  • Monitoring: The system indicates relevant operating conditions or faults where its design provides these functions.

Some systems also include manual controls and standby power supplies.

The exact sequence depends on the building’s smoke control strategy and the equipment installed.

Automatic opening smoke vents help manage smoke movement during a fire and can support safer conditions within designated escape routes.

Depending on the system design, potential benefits include:

  • Smoke management: Helping smoke and hot gases leave designated areas.
  • Escape route protection: Supporting improved conditions in stairwells, corridors and other relevant spaces.
  • Firefighter access: Helping emergency crews work within the building’s planned smoke control arrangements.
  • Automatic operation: Activating the appropriate vents when the system receives a specified fire signal.
  • System integration: Coordinating smoke ventilation with relevant fire detection and control equipment.

An AOV system cannot guarantee smoke-free escape routes or eliminate fire damage. Its effectiveness depends on suitable design, installation, commissioning and maintenance.

Automatic opening smoke vents commonly form part of smoke control arrangements in multi-storey residential buildings, commercial premises and other buildings with specific escape route requirements.

Examples may include:

  • Blocks of flats with communal corridors or stairwells
  • Commercial buildings with protected escape routes
  • Buildings that use natural smoke ventilation systems
  • Premises with smoke shafts or designated smoke ventilation openings
  • Buildings where the approved fire safety design specifies automatic smoke ventilation

Not every commercial building requires an AOV system.

The need for smoke ventilation depends on the building’s design, relevant building regulations, fire safety strategy and applicable risk assessment findings.

UK fire safety legislation does not require every commercial building to install automatic opening smoke vents.

However, some buildings need smoke ventilation as part of their approved fire safety design or applicable building regulations requirements.

In England and Wales, the Regulatory Reform (Fire Safety) Order 2005 requires the Responsible Person to manage fire safety risks and maintain relevant fire safety precautions.

If your building relies on an AOV system to support its fire safety strategy, you must make suitable arrangements to keep that system effective.

Review the building’s fire strategy, relevant documentation and fire risk assessment to understand your responsibilities.

Yes. Many automatic opening smoke vent systems can communicate with compatible fire alarm or smoke detection equipment.

Depending on the building’s design, the connection may allow a fire signal to activate specific vents, smoke shafts or other smoke control components.

Before making changes, engineers should confirm:

  • Compatibility between the fire alarm and smoke control equipment
  • The required activation signals and control interfaces
  • Which vents should open under different fire conditions
  • Any manual override or firefighter control requirements
  • Power supply and fault monitoring arrangements
  • Commissioning and cause-and-effect testing requirements

Do not assume that every fire alarm signal should open every vent. The system must follow the building’s agreed smoke control strategy.

Automatic opening smoke vents need regular testing to help confirm that they operate correctly when the building requires smoke ventilation.

Building managers should establish a routine testing programme that follows the relevant smoke control guidance, system design and manufacturer’s instructions.

Weekly functional checks commonly form part of smoke control system management. Some systems also require additional periodic checks and more detailed specialist testing.

Routine tests may check:

  • Whether the appropriate vents open when the system receives a test signal
  • Whether the control panel displays faults or warning indications
  • Whether vents move without obvious obstruction
  • Whether the system returns to its normal operating condition
  • Whether staff record test results and report faults

Follow an agreed test procedure to avoid interfering with the building’s fire safety arrangements.

Routine user tests do not replace competent specialist maintenance.

Automatic opening smoke vent systems need specialist inspection and maintenance to help ensure that their mechanical and electrical components remain reliable.

BS 7346-8:2013 provides recommendations for smoke control system maintenance. The maintenance programme should also reflect the manufacturer’s instructions, system design and building risks.

Competent specialist maintenance commonly includes at least an annual service, alongside regular routine testing and any additional checks the installation requires.

A specialist visit may include:

  • Inspecting actuators, motors and moving components
  • Checking vents, hinges and opening mechanisms
  • Testing control panels and relevant fault indications
  • Checking primary and standby power arrangements
  • Verifying automatic activation and manual controls
  • Testing relevant interfaces with the fire alarm system
  • Recording defects and recommending corrective action

SS Systems explains that its standard fire alarm service agreement does not automatically include the complete smoke ventilation system. Confirm the scope of any separate AOV maintenance arrangement before booking.

If an automatic opening smoke vent fails, the system may not provide the smoke ventilation response that the building’s fire safety strategy requires.

Possible faults include:

  • Actuator or motor failures
  • Obstructed or damaged vent mechanisms
  • Control panel or communication faults
  • Power supply or standby battery problems
  • Incorrect activation signals
  • Damaged wiring or connections

Report faults promptly and arrange an assessment by a competent smoke control specialist.

The Responsible Person should consider whether the fault affects escape arrangements and whether the building needs temporary fire safety measures while repairs take place.

Do not leave a known fault unresolved simply because the fire alarm system still operates.

SS Systems can discuss specialist automatic opening smoke vent maintenance alongside your existing fire alarm servicing requirements.

However, the company’s standard fire alarm service agreement does not automatically cover the complete AOV installation, including its mechanical equipment and motors.

Before arranging maintenance, confirm which components and tests the agreement includes and whether the work requires a separate specialist service.

Providing details of your existing smoke ventilation system and building smoke control strategy will help establish the appropriate scope.

Call SS Systems on 03300 417 170, email sales@sssystems.co.uk or visit our Contact Us page to discuss your requirements.

Advice When Choosing and Maintaining Automatic Opening Smoke Vents

Start by reviewing your building’s fire safety strategy and identifying the role that automatic opening smoke vents play in protecting escape routes.

Different buildings need different smoke control arrangements, so avoid selecting equipment solely on the basis of vent size or initial cost.

Consider:

  • The building’s layout, height and occupancy
  • The location of protected stairwells, corridors and smoke shafts
  • The intended movement of smoke and replacement air
  • The required activation sequence during a fire
  • The location of existing smoke detectors and fire alarm equipment
  • Any firefighter controls or manual override arrangements
  • Access for testing, inspection and maintenance

Ask a competent smoke control specialist to review the existing design before making significant changes.

Keep the building’s smoke control strategy available for engineers who inspect, service or modify the system.

Select automatic opening vents and actuators that suit the building’s smoke control design and operating conditions.

Windows, roof vents and louvres have different performance characteristics, so check the complete assembly rather than assessing the actuator alone.

Review the following:

  • Vent performance – Confirm that the proposed opening provides the required smoke ventilation capacity.
  • Product classification – Check the relevant BS EN 12101-2 performance requirements for natural smoke and heat exhaust ventilators.
  • Opening mechanism – Make sure the actuator suits the vent’s weight, dimensions and operating requirements.
  • Environmental conditions – Consider wind, rain, temperature and exposure.
  • Power arrangements – Confirm the appropriate supply and standby power requirements.
  • Maintenance access – Allow engineers to inspect and test the equipment safely.

Ask the supplier or designer to explain how the selected components meet the building’s specific smoke control requirements.

Choose a provider that understands the standards and guidance relevant to automatic opening smoke vents.

BS 7346-8:2013 provides recommendations for planning, designing, installing, commissioning and maintaining smoke control systems. BS EN 12101-2 covers natural smoke and heat exhaust ventilators.

Before approving work, check that the provider has considered:

  • The building’s smoke control strategy
  • The relevant product performance and classification requirements
  • The required vent locations and opening arrangements
  • Automatic activation and manual control requirements
  • Primary and standby power supplies
  • Integration with fire detection and alarm equipment
  • Commissioning, documentation and maintenance

Ask about relevant third-party certification and confirm that its scope covers the work you require.

Product conformity alone does not confirm that the complete smoke control installation meets the building’s design requirements.

Establish how the automatic opening smoke vent system should respond to fire detection signals before installing or modifying equipment.

The correct response may vary between floors, smoke zones and escape routes.

Discuss:

  • Activation signals – Identify which detectors or controls should initiate smoke ventilation.
  • Vent selection – Confirm which vents should open for each relevant fire condition.
  • Manual controls – Establish the required firefighter and authorised-user controls.
  • Fault indications – Agree how the system will identify relevant faults.
  • Power failure – Confirm how standby supplies support the intended response.
  • System testing – Agree how engineers will verify the full cause-and-effect sequence.

Document these requirements and make sure the fire alarm and smoke control specialists coordinate their work.

Do not change activation settings without considering the effect on the wider smoke control strategy.

Introduce a routine testing programme to help identify faults before an emergency occurs.

Follow the building’s smoke control documentation, relevant standards and the manufacturer’s instructions when setting test intervals and procedures.

Your programme should cover:

  • Routine functional tests – Check the appropriate smoke ventilation response at the agreed intervals.
  • Control panel checks – Review fault and status indications.
  • Vent movement – Confirm that the relevant vents open and close as intended.
  • Obstructions – Check for objects, building alterations or damage that could restrict movement.
  • Test records – Record results, faults and corrective action.
  • Staff responsibilities – Identify who carries out routine checks and reports problems.

Weekly testing commonly forms part of smoke control management, but your building’s agreed procedure should determine the checks and their frequency.

Train designated staff to follow the correct test sequence and avoid operating controls without appropriate instruction.

Arrange competent specialist maintenance for the complete automatic opening smoke vent system, not just its connection to the fire alarm.

SS Systems explains that its standard fire alarm maintenance agreement does not automatically include the mechanical parts of an AOV installation. Confirm the scope of your service contract to avoid gaps in maintenance.

Ask your maintenance provider to consider:

  • Actuators, motors and operating mechanisms
  • Vent hinges, frames and moving components
  • Control panels and relevant wiring
  • Primary and standby power supplies
  • Automatic activation and manual controls
  • Fire alarm interfaces and cause-and-effect operation
  • Fault monitoring and system indications
  • Maintenance records and outstanding repairs

BS 7346-8:2013 provides relevant smoke control maintenance guidance. Arrange specialist servicing at suitable intervals, including at least an annual visit where the applicable guidance and system requirements call for it.

Ask your provider to explain exactly what each maintenance visit includes and who will take responsibility for any excluded equipment.

Make sure automatic opening smoke vents can operate without obstruction whenever the building needs them.

Routine building activities, alterations and poor maintenance can affect vent movement or smoke flow.

Take practical precautions:

  • Keep designated ventilation openings clear.
  • Check that stored materials do not restrict access to controls or equipment.
  • Report damaged windows, louvres and roof vents promptly.
  • Investigate unusual noises or incomplete opening movements.
  • Check for damage after severe weather or building works.
  • Arrange competent repairs when engineers identify faults.
  • Record defects and confirm when contractors complete corrective work.

If a fault affects the building’s smoke control arrangements, the Responsible Person should assess the risk and consider appropriate temporary precautions.

Do not disconnect or disable smoke control equipment without suitable authorisation and a clear plan for managing the resulting risk.

Keep clear records of your automatic opening smoke vent system so building managers and maintenance engineers can understand how it should operate.

Useful documents include:

  • The building’s smoke control strategy
  • System drawings and vent location plans
  • Equipment schedules and manufacturer instructions
  • Control panel and actuator specifications
  • Cause-and-effect information
  • Installation and commissioning records
  • Routine testing and specialist servicing reports
  • Fault records, repairs and system modifications

Store these records where authorised staff and relevant contractors can access them.

Review the documents after alterations to the building or smoke control system.

Accurate records help engineers investigate faults, compare system performance and plan suitable maintenance.

Choose a smoke ventilation specialist who understands the relationship between automatic opening vents, fire detection equipment and the building’s overall fire safety strategy.

Before appointing a provider, ask about:

  • Experience with similar smoke ventilation systems
  • Knowledge of BS 7346-8 and relevant BS EN 12101 standards
  • Competence in both electrical controls and mechanical vent operation
  • Commissioning and cause-and-effect testing
  • Access to suitable replacement parts
  • Routine servicing and fault response arrangements
  • Clear reporting and maintenance documentation

Review the smoke control system when you alter escape routes, change the building layout or modify the fire alarm installation.

SS Systems can discuss your existing fire alarm arrangements and the specialist AOV maintenance requirements for your premises.

Bonus Tip: Create an AOV asset register that identifies every vent, actuator, control panel and relevant interface. Record its location, equipment details, maintenance responsibilities and latest test results. This helps building managers identify which contractor maintains each component and reduces the risk of overlooking equipment during servicing.

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