AOV & Smoke Damper
Testing & Compliance
Automated Opening Vents and smoke control dampers are active life safety systems in residential buildings. If they don't operate when fire strikes, smoke fills escape routes in minutes. BS 7346-8 requires 6-monthly specialist testing — we make that simple.
If a vent or actuator we certify is later found non-compliant due to an error on our part, we re-test and remediate it free. Every AOV is trigger-tested, panel-checked and photographed by our own BESA-qualified engineers — never subcontracted — and documented so your fire risk assessor, insurer or enforcement officer accepts it first time.
Choose the right testing scope
This page covers smoke-control systems and AOVs. For dampers in general ventilation ductwork, see fire and smoke damper inspection and testing. Testing frequency and controls requirements depend on the installed system, manufacturer guidance and applicable maintenance programme.
Looking for ductwork hygiene rather than smoke-control testing? See TR19 Air 2026 supply and extract ventilation cleaning.
What Are AOVs and Smoke Dampers?
An AOV (Automated Opening Vent) is a mechanical vent at the head of a stairwell or roof level that opens automatically to clear smoke from escape routes. Smoke dampers are motorised dampers inside smoke shafts and ductwork, controlled by the fire alarm panel. Both are active systems — they rely on batteries, actuators, control panels and detectors working together, first time, in an emergency.
Untested AOV systems put lives at risk:
- Standby batteries in AOV control panels degrade and fail — often with no visible warning until tested
- Seized actuators on vents that haven't been exercised since installation won't open when needed
- Faulty control panels may not trigger the correct vents in the correct fire zones
- Manual call points painted over by decorators won't work in an evacuation
- Smoke detection tied into the smoke control system may be disconnected or faulty
- Building owners and managers face prosecution under the Fire Safety Order 2005 for failure to maintain
Who Needs AOV Testing?
Any residential building with a mechanical smoke ventilation system. This includes apartment blocks, student accommodation, sheltered housing, housing association properties, and mixed-use buildings with residential above commercial.
RESIDENTIAL BLOCKSHow Often Must They Be Tested?
BS 7346-8:2013 and BS 9991:2024 require 6-monthly specialist testing of all smoke control systems. This is more frequent than fire damper testing because AOVs are active systems with more failure points.
EVERY 6 MONTHSWho Is Responsible?
The Responsible Person under the Regulatory Reform (Fire Safety) Order 2005 — typically the building owner, managing agent, or freeholder — has a legal duty to ensure smoke control systems are maintained and tested.
LEGAL DUTY OF CAREWhat Does BS 7346-8 Require?
BS 7346-8:2013 is the British Standard for the testing and maintenance of smoke control systems. BS 9991:2024 (fire safety in residential buildings) mandates 6-monthly testing. BS EN 12101 covers the product standards for individual components. Together, these standards ensure that every component in the smoke control chain works when it's needed.
Control Panel & Battery Test
The AOV control panel is checked for fault indicators, and standby batteries are tested under load to confirm they'll power the system if mains fails during a fire.
Actuator & Vent Testing
Every AOV vent and smoke damper is physically actuated to confirm it opens and closes correctly. Seized or slow actuators are flagged for remediation.
Call Point & Detector Check
Manual call points and smoke detectors tied into the smoke control system are tested to confirm they trigger the correct zone response on the panel.
Full Compliance Documentation
A complete test report is produced for every component — pass or fail — with remediation recommendations. This is your legal proof of compliance for fire authorities and insurers.
What We Do on Every Visit
Panel & System Survey
We start at the control panel — checking for faults, testing batteries under load, and mapping all connected devices across the building.
Component Testing
Every AOV vent, smoke damper, manual call point, and detector is physically tested. Each actuation is recorded in real time against the panel log.
Zone Logic Verification
We confirm that automatic triggers from the fire detection system activate the correct vents in the correct fire zones — not just that components work in isolation.
Remediation & Report
Defects are documented with photos and a remediation schedule. Compliance certification is issued on completion, ready for your fire safety file.
AOV & Smoke Damper Testing FAQ
What's the difference between fire dampers and smoke dampers?
Fire dampers are passive — a fusible link melts at 72C and the damper snaps shut to stop fire spreading through ductwork. Smoke dampers are active — they're motorised and controlled by the fire alarm panel, opening or closing based on which fire zone is triggered. AOVs are vents that open to clear smoke from escape routes. Both need testing, but to different standards and different frequencies.
Can you test our fire dampers at the same time?
Yes. Most apartment blocks have both fire dampers in the ductwork and AOV/smoke control systems. We test both in a single visit — one engineer, one report, full fire and smoke compartmentation compliance together. That's the most efficient way to handle it.
How long does AOV testing take?
A small block with one stairwell and a single roof AOV typically takes 2-3 hours. A large multi-core building with 20+ AOVs and smoke dampers could take a full day. We'll provide a time estimate when we survey your site.
What happens if a component fails the test?
Common failures like dead batteries can often be replaced on the spot. For seized actuators or faulty panels, we provide a written remediation quote and interim risk management advice. The failed component is logged in the report with a recommended action date.
We don't have records of our AOV system — where do we start?
Start with us. We'll survey the building, identify all AOV and smoke control components, map them to the control panel, and create a full asset register as part of the first test. Many buildings we visit have incomplete or outdated system documentation — we build it from scratch.
Why do AOV actuators fail?
The three causes we see most are dead or weak batteries (many actuators run on battery back-up that sits untouched between tests), seized mechanisms from dirt and weather exposure on roof vents, and control panel or power faults. A vent that opens on a detector trigger but not on manual call point — or the other way round — usually points to a control fault rather than the actuator itself. Every component gets its own line in our report, so you know exactly what passed, what failed, and why.
Which British Standard covers AOV testing?
Smoke control systems are tested and maintained to BS 7346-8, the code of practice for smoke control systems, with the system's fire safety design — vent sizes, trigger logic, free area — governed by BS 9991 for residential buildings. Your testing records should reference the standard your system was designed and installed to. We check both, and the report cites them, so your fire risk assessor can trace every requirement back to a result.
What does a valid AOV test certificate need to include?
Every vent and actuator listed with an individual test result, panel and battery readings, call point and detector trigger tests, photographic evidence, a defect schedule with remedial actions, the engineer's qualifications and the test date — with the standards referenced throughout. If your current certificate is one line saying "system tested and working", it will not survive a fire risk assessment or an insurance review. We issue documentation you can hand straight to your assessor.
Are there minimum requirements for AOV systems?
Yes — and this is where a lot of buildings fall short. The vents must achieve the free area the building was designed with, open automatically on the correct trigger (smoke detection or manual call point), and behave correctly on power failure — some systems fail open, some fail closed, and the report should record which yours does and verify it actually happens. Battery back-up where fitted has to hold the vent in its designed state. All of it gets tested and recorded, not assumed.
How much does AOV testing cost?
It depends entirely on the number of vents, actuators and panels, and on access. A small single-stair block is a half-day job; multi-core buildings take longer. We quote free after a quick site survey — and if the same building has fire dampers in the ductwork, testing both in one visit is the cheapest way to cover both obligations.
Related guides
AOV testing guide for property managers · Smoke damper maintenance guide · Fire damper testing to BS 9999 · The 2-Year Compliance Lock
Book Your AOV & Smoke Damper Test
Don't wait for a fire risk assessment to flag your smoke control system as overdue. BS 7346-8 requires 6-monthly testing — get compliant now with full documentation.
Most blocks we test also have fire dampers in the ductwork — test both in one visit: fire damper testing to BS 9999. Managing the building long-term? Lock today's prices for 24 months with the 2-Year Compliance Lock.