What Are AOV Systems and Why Are They So Important?

During a fire, smoke is often more dangerous than the flames themselves. Smoke can quickly fill corridors, stairwells, and escape routes, reducing visibility and making evacuation difficult.

Automatic Opening Vent (AOV) systems are designed to remove smoke from buildings during a fire, helping occupants escape safely while providing firefighters with improved access and visibility.

At FireGen Fire & Security, we provide professional AOV system installation, commissioning, maintenance, fault finding, repairs, and servicing throughout London, Essex, Kent, and the surrounding areas.

What Is an AOV System?

An AOV (Automatic Opening Vent) is a smoke control system that automatically opens vents, windows, roof hatches, or louvres when a fire is detected.

The system is typically activated by:

• Fire alarm systems
• Smoke detectors
• Heat detectors
• Smoke control panels
• Firefighter override controls

Once activated, the AOV creates a path for smoke to escape, helping to keep escape routes clear and reducing the build-up of dangerous smoke within the building. (Fire Risk Assessment Network⁠)

Why Are AOV Systems Important?

Research and fire safety guidance consistently identify smoke as one of the greatest threats during a fire.

A properly functioning AOV system helps to:

• Improve visibility during evacuation
• Reduce smoke build-up
• Protect escape routes
• Support firefighting operations
• Reduce heat accumulation
• Improve overall life safety

In many residential and commercial buildings, smoke control systems form a critical part of the building’s fire strategy. (Fire Risk Assessment Network⁠)

Are AOV Systems a Legal Requirement?

Many buildings are required to have smoke control measures as part of their fire safety design.

Requirements are typically determined by:

• Building Regulations Approved Document B
• The Regulatory Reform (Fire Safety) Order 2005
• BS 9991
• BS 9999
• BS 7346-8
• BS EN 12101 standards

These documents provide guidance on where smoke control systems may be required and how they should be maintained throughout their service life. (GOV.UK⁠)

Where Are AOV Systems Commonly Installed?

AOV systems are frequently found within:

• Apartment blocks
• Residential developments
• High-rise buildings
• Hotels
• Care homes
• Commercial buildings
• Shopping centres
• Offices
• Schools and universities

Common locations include:

Stairwells

Smoke vents help keep escape stairs clear and usable during an evacuation.

Corridors

Corridor smoke ventilation assists in maintaining tenable escape routes.

Smoke Shafts

Many apartment buildings use smoke shafts connected to corridor vents to extract smoke safely from multiple floors. (Fire Risk Assessment Network⁠)

Atriums

Large open spaces often require specialist smoke control solutions to manage smoke movement effectively.

Types of Smoke Ventilation Systems

Not all smoke control systems operate in the same way.

Natural AOV Systems

Natural systems use smoke vents, roof hatches, windows, or louvres that open automatically to release smoke and heat.

Benefits include:

• Low running costs
• Minimal maintenance requirements
• Reliable operation
• Energy efficiency

Mechanical Smoke Ventilation Systems

Mechanical systems use fans to actively remove smoke from the building.

Benefits include:

• Suitable for complex buildings
• Effective over greater distances
• Enhanced smoke extraction performance

Smoke Shaft Systems

Smoke shafts provide a dedicated route for smoke removal from corridors and common areas, particularly in residential developments. (Fire Risk Assessment Network⁠)

Components of an AOV System

A typical smoke ventilation system may include:

• Smoke control panel
• AOV control equipment
• Roof vents
• Smoke vents
• Window actuators
• Smoke shaft dampers
• Firefighter override switches
• Interface modules
• Backup batteries
• Smoke and heat detectors

All components must operate correctly together to achieve the intended fire strategy. (FDS Maintenance⁠)

Why AOV Maintenance Is Essential

Installing an AOV system is only part of the solution.

Like any life safety system, smoke ventilation equipment requires regular inspection, testing, and maintenance to ensure reliable operation during an emergency.

Without maintenance, issues such as failed actuators, damaged vents, battery faults, wiring defects, or control panel failures may go unnoticed until a real emergency occurs. (FDS Maintenance⁠)

Recommended AOV Maintenance

Industry guidance recommends routine inspections and planned maintenance to ensure smoke control systems remain fully operational.

Maintenance typically includes:

• Functional testing
• Battery testing
• Actuator testing
• Vent operation checks
• Cause and effect testing
• Interface testing
• Firefighter control testing
• Fault diagnosis
• System reporting

Regular maintenance supports compliance with BS 7346-8, BS 9999 and other applicable smoke control standards. (Sertus⁠)

Common AOV Faults We Encounter

Our engineers regularly attend sites for:

• AOV panel faults
• Battery failures
• Actuator failures
• Open circuit faults
• Vent communication faults
• Damaged smoke vents
• Firefighter switch issues
• Cause and effect faults
• Water ingress issues
• System activation faults

Prompt investigation and repair help ensure the building remains protected and compliant.

Why Choose FireGen Fire & Security?

At FireGen, we understand that AOV systems are critical life safety systems that must perform correctly when needed most.

Our experienced engineers provide reliable smoke ventilation services tailored to residential, commercial, and mixed-use developments.

Our AOV Services Include:

✓ AOV Installation

✓ AOV Maintenance

✓ AOV Servicing

✓ Smoke Vent Testing

✓ AOV Fault Finding

✓ Smoke Control Repairs

✓ Actuator Replacement

✓ Battery Replacement

✓ Control Panel Upgrades

✓ Annual Compliance Inspections

✓ Emergency Call Outs

All works are completed in accordance with current industry standards and recognised fire safety guidance.

Protect Your Building with FireGen

AOV systems play a vital role in protecting lives by keeping escape routes clear of smoke during a fire. Regular servicing, testing, and maintenance help ensure your smoke control system operates exactly as intended when an emergency occurs.

Whether you require a new AOV installation, smoke vent maintenance, fault diagnosis, or ongoing compliance support, FireGen Fire & Security can help.

Contact FireGen Today

Visit www.firegen.co.uk to arrange a free quotation or speak with our team about your smoke ventilation requirements.

FireGen Fire & Security – Protecting Lives, Property & Business 24/7.