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What are AOV Windows?
AOV windows are vents used to extract smoke from stairwells, corridors and other internal areas as part of a smoke ventilation system.
When activated, they open automatically to release smoke from the building, helping to protect escape routes.
AOV windows are typically designed to achieve around 1.0m² free vent area, and are tested and certified to BS EN 12101-2.
Not sure what size or configuration you need? Our specialists can help review your project and recommend the right solution.
Standard and Bespoke AOV Windows
We supply a range of AOV windows suitable for both standard and bespoke applications, designed to meet project-specific opening sizes and free vent area requirements.
- Top hung, side hung, and bottom hung window configurations
- Available with customised inserts such as Georgian and astragal bars
- Range of finishes and RAL colour options to suit the building design
All windows are supplied with actuators pre-installed, tested as a complete unit, and certified to BS EN 12101-2.
AOV windows are a common smoke ventilation solution, but they aren’t suitable for every building. Where opening windows aren’t practical or the building is close to a boundary, a smoke vent louvre may be a better option.
AOV Window Kits
We supply complete AOV window kits for stairwell smoke ventilation, with all components selected to work together as part of a compliant system. Kits can be tailored to suit your project and fire strategy.
How to Order Your System
Drawings, fire strategy, or a quick overview of your project
Know what you need? We’ll price it. If not, we’ll recommend the right setup.
Clear pricing, fast lead times, and ongoing support when you need it
Dedicated Smoke Ventilation Experts
Every project is supported by a dedicated smoke ventilation expert who’ll review your drawings and fire strategy, recommend the right solution, and provide technical support from specification through to completion.
Key Considerations for AOV Windows
Compliance and Standards
AOV windows used for smoke ventilation must meet relevant fire safety standards.
Key standards include:
We supply fully tested and certified products to ensure the system performs correctly in the ever of a fire.
Whether you need a single AOV window or a complete smoke ventilation solution, we can help. Send us your drawings, fire strategy or a quick overview of your project and we’ll recommend a suitable, compliant AOV window or a complete kit.
Frequently Asked Questions
- What standards apply to AOV windows?
AOV windows used as part of a smoke ventilation system are typically specified in accordance with the project’s fire strategy and relevant guidance, including Approved Document B, BS 9991 and BS 9999. Requirements can vary depending on the building type, layout and smoke control strategy.
Our AOV windows are tested and certified to BS EN 12101-2 and can be supplied as part of a complete smoke ventilation solution, helping ensure compliance with the project’s smoke ventilation requirements.
- Can AOV windows be supplied in custom sizes?
Yes. AOV windows are available in both standard and bespoke sizes. This is particularly useful where a specific free vent area must be achieved or where the window needs to match an existing façade design.
- How much free vent area can an AOV window provide?
The free vent area achieved by an AOV window depends on the window dimensions, opening angle and overall design. While many stairwell systems are designed for 1.0m² aerodynamic free vent area, the required FVA should always be checked against the project’s fire strategy.
Two windows of a similar size can deliver very different performance, which is why FVA should always be considered during specification.
- Do I need an AOV window or a fire-rated window?
AOV windows and fire-rated windows serve different purposes. An AOV window helps remove smoke and heat during a fire. While a fire-rated window helps prevent the spread of fire between compartments. Some projects require one, while others may require both. Reviewing the fire strategy and building layout is the best way to determine the most suitable solution. Learn more about fire rated windows here
- Do I need a specialist to fit an AOV window?
Generally, no. Any suitably qualified window fitter or FENSA registered contractor can install an AOV window.
Bear in mind windows must be installed true and square to avoid inhibiting motor function, and you may require a specialist to install and commission your controls.