Fire Alarms for Restaurants and Commercial Kitchens: Detection Around Heat and Steam

Kitchen detection done properly

• Heat detectors (fixed-temp/rate-of-rise per position) through cooking areas — never optical; steam and char are lunch, not emergencies (the detector-type guide's first commandment)
• Canopy/duct considerations: grease-laden extract is the fire highway — detection/suppression provision per system design, cleaning regimes logged (insurers ask; so do we at service)
• Suppression interface: Ansul-class wet chemical systems interlock with the alarm (activation = alarm event), gas solenoid shut-off proving on the cause-and-effect — commissioning walks it for real
• CO₂/gas interlock panels where fitted join the same documented logic
• Call point at kitchen exit; sounder/beacon audible over service noise (85dB+ ambient is normal — design for it)
• Multi-sensor transition zones (pass, plating) where kitchen air drifts front-of-house — placement beats fighting physics

Front of house, licensing and late-night reality

Dining areas follow normal workplace logic — escape-route detection per assessment (M-to-L4/L3 small venues; more where floors/complexity stack), sounders proven against music/crowd levels, call points at exits — with hospitality wrinkles: licensing inspections expect visible fire competence (certificates, tested systems, trained staff — fire safety features in licence reviews after incidents), staged-alert configurations for venues where instant full-evacuation tones create crush risk (staff-alert first in larger/multi-floor venues — design conversation, documented), and music-system mute interfaces where sound levels would bury sounders. Late-licence venues add the empty-by-4am pattern: monitored signalling so the post-close fryer fault meets a response, not an opening-time discovery (the monitoring guide's empty-building logic applies squarely).

Costs, takeovers and the inspection file

Installed ranges: café/small restaurant (conventional, kitchen heat + FOH coverage): £1,500–£3,000; full-service restaurant with suppression interface and zoning: £2,500–£5,000; multi-floor/late venues beyond. The takeover scenario dominates hospitality — inherited systems with optical heads over fryers, dead zones from refits, suppression never interfaced: a condition survey plus targeted remedials (£300–£1,500 typical) routinely beats replacement. Compliance rhythm: weekly tests around prep time (the how-to adapted to hospitality hours), 6-monthly servicing scheduled dark-day mornings (£200–£400/yr), suppression servicing aligned, and the file (certificates, zone plan, cause-and-effect, log) ready for EHO/licensing/insurer eyes — our pubs-restaurants page wraps the wider package including extinguishers and emergency lighting for the same premises.