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Commercial Kitchen Gas Safety Systems

A compliant commercial kitchen brings ventilation, gas control and detection together as one safety system — designed to BS 6173, installed to IGEM/UP/19 and evidenced with a CP42.

  • Ventilation interlock on every mechanically ventilated gas kitchen
  • CP42 records the inspection of the catering installation
  • Annual test of interlock, e-stops, valve and detection

System architecture

Fan SensorsPressure / airflow / currentEmergency StopLatching e-stop buttonsGas DetectionMethane · CO · CO₂Interlock ControllerGas safety control panelProving PanelPressure proving testSolenoid ValveNormally closed shut-offAppliancesCatering / boilersproving result
Interlock Controller → Fan Sensors → Proving Panel → Solenoid Valve. Losing any proof of ventilation de-energises the valve and isolates the gas supply.

The elements of a compliant kitchen

  • Extract canopy with correct capture velocity and accessible grease filters
  • Make-up air supply balanced against extract volume
  • Interlock control panel proving extract and input air
  • Gas pressure proving where appliance taps are accessible to staff
  • Normally closed solenoid valve on the catering gas line
  • Emergency gas shut-off buttons on escape routes
  • Gas detection and CO detection where flueing or layout requires it

CP42 and compliance records

The CP42 is the commercial catering inspection record. Alongside it keep the interlock commissioning certificate, ventilation air volume readings, detection calibration certificates and a maintenance log for filters and fans.

  • Annual gas safety inspection by a Gas Safe commercial engineer
  • Documented interlock functional test with trip times
  • Ventilation air volumes measured and recorded
  • Detection calibration certificates within 12 months
  • Staff trained on start-up, e-stops and reset procedure

Who is responsible

The duty holder — usually the operator, landlord or facilities manager — must ensure the system is maintained and records are available. Schools, care homes and multi-site restaurant groups typically carry this in a planned maintenance contract.

From our engineers' vans

Photos from real jobs — the equipment described on this page, installed and serviced by our engineers.

Merlin CT1750 kitchen safety interlock panel installed by our engineers
Merlin CT1750 interlock panel — kitchen safety system install
Commercial kitchen gas pipework with quick release catering hoses
Commercial kitchen gas pipework & quick release hoses

Frequently asked questions

What is a CP42?

The industry commercial catering gas inspection record, completed by a Gas Safe registered engineer and covering appliances, ventilation and the interlock system.

Can a kitchen trade with a failed interlock?

No. A defective interlock makes the installation at risk; the gas must be isolated until it is repaired and retested.

Related guides

Parts in stock — ready to fit

Held in UK stock and carried on our vans, so most jobs are fixed in one visit.

  • Replacement gas interlock systems

    Merlin, Medem, Intelligas, S&S Northern

    In stock today

  • Air pressure switches

    Fan & gas proving pressure switches

    In stock today

  • Gas solenoid valves

    Normally closed safety shut-off valves

    In stock today

  • Quick release gas catering hoses

    Commercial ranges, bays & mobile catering

    In stock today

  • Super universal thermocouples

    Fits most commercial gas appliances

    In stock today

  • Need a part fitted?

    Same-day engineer dispatch with these parts on the van.

  • Gas Safe Registered

    Commercial catering & plant

  • 24/7 UK Response

    Same-day emergency dispatch

  • Vetted Engineers

    DBS checked for schools & care

  • Transparent Pricing

    Fixed callout, quoted parts

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