A vape detector is a sensor that monitors the air for the aerosol produced by e-cigarettes and sends an alert to staff, usually to a phone or tablet app, without sounding the building's fire alarm. Schools, offices and other workplaces fit them in toilets, washrooms and other private areas where vaping is not allowed. And yes, vaping can set off a fire alarm. Dense vapour close to a smoke detector can trigger it, and optical smoke detectors are the type most likely to react.
This guide explains how vape detectors work, how they differ from fire detectors, and what you can do about false fire alarms caused by vaping.
What is a vape detector?
A vape detector is a monitoring device, not a life-safety device. It watches for the signature of vaping in a room and reports it to the people responsible for that space, such as a head of year, facilities manager or site supervisor. They can then deal with it under the school's or employer's vaping policy.
Vape detectors are usually installed where a camera would be inappropriate, including:
- pupil and staff toilets and washrooms
- changing rooms
- stairwells, corridors and quiet corners of a building
- staff rooms, stores and plant rooms where smoking and vaping are banned
How vape detectors work
Particle sensing
When someone vapes, they exhale a cloud of fine liquid droplets. Many vape detectors, including the Hispec Mains Powered SMART Vape Detector (HSSA/VAPE), use a laser-scattering particle sensor that measures fine particles in the air (PM2.5). When the particle level rises above a set threshold, the detector records an event and raises an alert.
Alerts to staff, not an evacuation
The Hispec HSSA/VAPE connects to a 2.4GHz Wi-Fi network and works with the Tuya Smart app. It sends real-time alarm notifications to phones or tablets, and several users can share one account to see the status of each device. Sensitivity and the alert threshold are adjustable in the app. The unit also sends tamper and offline notifications, so staff know if a detector has been interfered with or has lost its connection.
Power and mounting
The HSSA/VAPE is mains powered through a plug adaptor and a 2.5m USB-C cable, and it can be mounted on a wall or ceiling. Plan each position so there is a socket within reach and a reliable Wi-Fi signal.
Other aerosols
A particle sensor measures particles, not nicotine, so deodorant sprays, air fresheners and dust can also raise the reading. Set the sensitivity to suit the room, and check any alert before acting on it.
Can a vape set off a fire alarm?
Yes, it can. Mid and West Wales Fire and Rescue Service lists vapes alongside steam, cigarette smoke, aerosol sprays and light cooking smoke as things that fire alarm systems can react to. Detector manufacturer Nittan Europe has made a similar point: when a group of people vape indoors at the same time, the vapour can affect smoke detectors in the same way steam does, especially optical ones.
The reason lies in how optical smoke detectors work. An optical (photoelectric) detector shines a light inside a sensing chamber. Smoke particles entering the chamber scatter that light onto a receiver, which triggers the detector. Vapour droplets scatter light too, so a thick cloud of vapour directly under a detector can look like smoke. The risk is highest in small, poorly ventilated rooms and when someone vapes right under the detector.
Heat detectors respond to temperature, not particles, so vapour does not trigger them. They are not a simple swap for smoke detection, though. The right detector for each area depends on the fire risk and the system design.
Vape detector vs smoke detector
| Vape detector | Fire alarm smoke detector | |
|---|---|---|
| Purpose | Enforces a no-vaping policy | Gives early warning of fire to protect life |
| Typical response | Silent alert to staff by app or notification | Fire alarm signal, sounders and evacuation |
| Connection | Wi-Fi to an app (Hispec HSSA/VAPE) | Wired or radio link to the fire alarm control panel |
| Standards | Not a fire detection product | Designed, installed and maintained to BS 5839-1 using certified EN 54 components |
| Replaces the other? | No | No |
A vape detector must never be used instead of fire detection, and fire detectors should never be removed, covered or desensitised to stop vaping alarms.
Managing false alarms caused by vaping
Repeated false alarms disrupt lessons and work, and they teach occupants to ignore the alarm. They can also lead to unwanted call-outs where the system is monitored. A practical approach:
- Record and investigate every false alarm. BS 5839-1:2025 recommends that the user investigates all false alarms and assigns each one the correct category. The FIA's guide to the changes sets out the trigger rates for preliminary and in-depth investigations. Note vaping-related activations in the fire alarm log book.
- Review detector selection with a competent person. The 2025 revision places more emphasis on multi-sensor detectors. Where point smoke detectors present a higher risk of false alarms, it recommends selecting multi-sensor detectors instead. Any change must still give the level of protection your fire risk assessment requires.
- Check detector siting. Detectors close to toilet cubicles, shower areas or extract routes may need reviewing as part of the system design.
- Use vape detectors to support your policy. An alert lets staff step in before vapour builds up, and it gives you evidence of where and when vaping happens.
- Communicate clearly. Signs and briefings explain that vaping is not allowed and that it can set off the fire alarm and disrupt everyone.
- Update the fire risk assessment and the emergency plan if false alarms keep happening.
Choosing a vape detector
- Power: mains powered (like the Hispec HSSA/VAPE) or battery powered, and whether a socket is available at each position.
- Connectivity: Wi-Fi coverage in washrooms and whether your IT policy allows the devices on the network.
- Alerts: who receives notifications, and how quickly they can respond.
- Tamper protection: tamper and offline alerts help in pupil areas.
- Adjustable sensitivity: lets you tune out aerosol sprays and dust.
- Privacy: particle-sensing detectors work without cameras. Tell staff, pupils and parents where the devices are and what they do.
Browse the Hispec range, or see our smoke detectors, multi-sensor detectors and heat detectors for the fire alarm itself. All products supplied by JEM Systems UK are genuine, brand new and factory sealed, with fast, tracked UK delivery.
FAQs
Can a vape set off a fire alarm?
Yes. Dense vapour can trigger smoke detectors, and optical detectors are the type most likely to react, especially when someone vapes directly beneath one in a small room. Heat detectors do not respond to vapour.
Is a vape detector a fire alarm?
No. A vape detector alerts staff that someone may be vaping. It is not a fire detection device, it does not replace smoke or heat detectors, and it should not be relied on for fire safety.
How does the Hispec vape detector send alerts?
The Hispec HSSA/VAPE connects to 2.4GHz Wi-Fi and sends notifications through the Tuya Smart app. It also sends tamper and offline alerts, and LED colours show standby, poor air quality (alarm) and fault states.
Will deodorant or air freshener set off a vape detector?
It might. Particle sensors respond to fine particles from many sources, so sprays and dust can raise readings. Use the adjustable sensitivity and check each alert before taking action.
Where should vape detectors be installed in a school?
Most schools start with pupil toilets and changing rooms, then add stairwells or other areas where vaping is reported. Each position needs power and a good Wi-Fi signal.
This guide is general information; follow your fire risk assessment and a competent person's advice.