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Wireless fire alarms (Ajax EN54)

Wireless fire alarms fit where cabling is disruptive, expensive or not allowed: listed buildings, busy offices, schools in term time and care homes. We install the Ajax EN54 range, designed and commissioned to BS 5839-1:2025, and our new Ajax EN54 systems can include FireFind.

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Written by Ricky Shaw, Technical Director. Last reviewed 30 September 2026.

Illustration: a single-storey floor plan with a detector and a sounder in every room, a manual call point at each of the three final exits, the control panel by the main entrance, and the fire alarm operating: first the kitchen heat detector, then the corridor smoke detector EXITEXITEXIT OfficeOfficeKitchenStore ReceptionMeetingPlantCorridor CIE 1 2 1Fire: kitchen heat detector 2Spreading: corridor Smoke detector HHeat detector Call point Sounder EXITFinal exit CIE = control panel
BAFE SP203-1
Registered No. 303674
Modules held
All four: design to maintenance
Certification body
NSI (Fire Silver)
Designed to
BS 5839-1:2025
Google reviews
120+ five-star

When wireless makes sense

  • Listed and historic buildings: no chasing walls and far fewer fixings
  • Occupied premises: installed in hours or days rather than weeks, with little dust or noise
  • Care homes and schools: less disruption to residents and pupils
  • Extensions and outbuildings: where running cable back to a panel isn’t practical
  • Changing layouts: devices can be moved as the building changes

The Ajax EN54 range

Ajax’s EN54 line is a complete wireless fire system: the EN54 Fire Hub control panel, smoke, heat and multi-sensor detectors (some with built-in sounders), sounders and visual alarm devices, manual call points, a range extender and an input/output module for connecting other equipment.

We’re an Ajax installer, and we design every Ajax EN54 system to BS 5839-1:2025 like any other fire alarm, starting with a radio survey of the building. At handover you get a wireless signal report alongside the usual certificates.

Ajax EN54 Fire Hub with a framed zone plan above it and a key switch beside it
An Ajax EN54 Fire Hub we installed, with its framed zone plan
Ajax EN54 manual call point with a clear protective cover and a numbered Nova device label
Ajax EN54 call point with a clear protective cover

Wired or wireless?

Both can be designed to BS 5839-1:2025. The right choice depends on your building, how it’s used and your budget.

Comparison of wired and wireless fire alarm systems
Wired (conventional or addressable)Wireless (Ajax EN54)
InstallationCable to every device; longer on siteMuch less cabling; usually quicker
DisruptionChasing, drilling and access to ceilingsMinimal, which suits occupied and listed buildings
Equipment costLowerHigher
Labour costHigherLower
BatteriesStandby batteries at the panel onlyBatteries in every device, replaced periodically
Changes laterNew cable runs neededDevices can be added or moved easily

Case study: a 54,000 sq ft warehouse

At Fileder Filter Systems’ three-storey warehouse in Maidstone, we installed 138 Ajax EN54 devices without running a single cable, and one range extender covered the whole building despite the metal racking. Ajax Systems featured the project as a customer story.

Read the case study

Built by Nova: FireFind

Every new Ajax EN54 system we install can include FireFind, our own fire location service. When the alarm operates, keyholders get a link to the building’s floor plan showing which detector has operated, and where the fire is spreading as more detectors operate.

It works alongside your panel and alarm monitoring. It doesn’t replace them, or a 999 call.

How FireFind works

Illustration: a phone showing a building floor plan with the detector in alarm marked in red Unit 4, first floor Fire detected Kitchen, detector 12 Landing, detector 9 Updated a few seconds ago
Illustration

Wireless fire alarm questions

Are wireless fire alarms reliable?

Yes, when they’re designed and installed properly. Radio devices must meet EN 54-25, which covers signal loss through the building, interference and loss of communication, and each device also meets its own part of EN 54. BS 5839-1:2025 has a dedicated clause on radio-linked systems. We carry out a radio survey before we install, and hand over a wireless signal report at commissioning.

Do the batteries need changing?

Yes, periodically. Ajax states device batteries last up to five years, and up to seven years in the call point. We check battery condition at every service and plan replacements, so you’re never caught out.

Is Ajax EN54 approved to BS 5839-1?

BS 5839-1 is a code of practice for designing, installing and maintaining systems, not a product approval. Ajax EN54 devices are certified to the relevant parts of EN 54, including EN 54-25 for radio, and we design, install and commission the system to BS 5839-1:2025.

Can wireless devices be added to our existing wired system?

Not usually to a different make of panel. The Ajax EN54 range works with its own hub, and its input/output module can pass signals to and from other equipment. We’ll look at your system and tell you what makes sense.

Is a wireless system cheaper?

Equipment usually costs more and installation usually costs less, because there’s far less cabling. Where both would suit your building, we can price both.

Ask about a wireless system

Tell us a little about the building and we’ll call you back within one working day. Prefer to talk? Call 01303 720282.

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Or talk to us

Call the office and you’ll speak to someone who knows fire alarms. We’re at Shearway Business Park in Folkestone.

Wireless fire alarms we’ve installed

All case studies