As a leading fire safety specialist, we know that Automatic Opening Vent (AOV) systems often raise important questions from what they do and why they matter, to how often they should be tested and what costs to expect.
In this guide, we answer the key questions our customers ask most often, covering not only practical advice but also how to keep compliant with UK fire safety regulations.
This will help you stay informed and ensure your building remains compliant.
What does AOV stand for?
AOV is short for automatic opening vent, sometimes called an automatic smoke vent, NSHEV (Natural Smoke Heat Exhaust Ventilator, smart smoke control system, or simply an AOV system. In an emergency, a building’s AOVs will help to clear heat, smoke and hazardous gases from lobbies, stairwells, and corridors. This helps people to safely escape and gives emergency crews faster access.
What’s the British standard for AOVs?
BS EN12101 is the harmonised European standard for smoke and heat control. Before an AOV can be certified to this standard, it needs to undergo stringent testing.
However, this standard applies to every component used in a smoke control system. The whole system will need be tested as a collective unit to make sure it’s compliant with all relevant building regulations.
Can an AOV double up as roof access?
There are many kinds of AOVs, including windows, glazed louvres, dampers and two-in-one roof access hatches. These hatches allow you and your teams to carry out roof maintenance, while maximizing the amount of light you get in a space.
Many AOV roof hatches come with offset actuator arms, which enable easier access to the roof area. It’s also possible to install ladder mounts and grab handles for simple ascent and descent.
How often should I test an AOV?
In line with fire safety regulations, you should carry out weekly visual checks of all smoke vents for signs of faults, misuse, or vandalism. Manual testing by a responsible person must be conducted every month to check all AOVs are in good working order.
You’ll need to have your AOVs serviced annually or bi-annually by a smoke vent specialist, with all maintenance certificates kept and logged. At JLA, we actually recommend bi-annual servicing for extra peace of mind, especially if you’re working in high-risk industries.
If any faults are found or reported in the interim periods, they must be addressed as soon as possible.
Take a look at our AOV testing and servicing guide for more information.
What does an AOV cost?
The price of an AOV system can vary significantly depending on several key factors. Size and configuration play a big role larger vents or systems designed for complex layouts will naturally cost more. Also, manual options are generally cheaper than fully automated systems with sensors and controls.
Installation complexity is another consideration. An installation in a new build will be less expensive than a retrofit that requires structural changes, which can also result in higher labour fees.
Finally, the type of vent, such as a window, hatch, or damper, affects pricing along with any servicing or maintenance package included.
Need advice on AOVs for apartment blocks?
With recent updates to building regulations following the Hackitt Report, clarity is essential for high-rise residential landlords and property managers.
If you’re responsible for an apartment block, Automatic Opening Vents (AOVs) are a critical part of fire safety compliance and resident protection. From smoke ventilation strategies to meeting legal requirements, understanding how these systems work is key.
Read our blog on AOV systems for apartment blocks.
How can JLA help you?
At JLA, we’re trusted fire safety experts with years of experience delivering compliant, reliable solutions for buildings of all sizes. From design and installation to ongoing maintenance, our team can help you integrate AOV systems seamlessly into your next project, ensuring safety and peace of mind.
Contact us today for more information.
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