AOV Smoke Vents

An Automatic Opening Vent (AOV) is an intelligent system that automatically opens in response to smoke detection. Installed in stairwells, lobbies, corridors, or roofs, AOVs remove smoke, heat, and toxic gases, maintaining tenable conditions for safe evacuation and fire service access.

Typical AOV components include:

• Smoke vents or AOV windows
• Actuators and control panels
• Smoke detection and control systems

Almost all components must comply with low-voltage requirements (typically 24V DC) to ensure safe operation during emergencies​.

Failing to install a compliant AOV system puts occupants at risk — and leaves developers and property owners open to enforcement action, delays, and fines. Properly installed AOV systems:

• Keep escape routes free from smoke and toxic gases
• Protect building structure by reducing fire spread
• Enable quicker, safer firefighting operations
• Ensure smoother Building Control approval processes

In England, guidance from the Fire Safety Act 2021 and Building Safety Act 2022 places even greater responsibility on building owners and managers to maintain operational fire safety systems, including AOVs.

Yes. Under the Construction Products Regulation (CPR) and BS EN 12101-2, all AOVs supplied and installed must be CE marked​.

For a protected stairwell, the AOV must provide a minimum 1.0m² free area.For lobbies and corridors, a minimum free area of 1.5m² is required​.

Yes. AOV systems can be installed in refurbishment projects. However, correct specification, fire engineering consultation, and regulatory compliance are essential, particularly when retrofitting into older or complex buildings.

AOV systems typically operate at 24V DC for safe, low-voltage functionality. Battery backup systems are often required to maintain operational performance during power outages​.