To comply with current gas safe regulations, BS6173 & to prevent build-up of CO2 in kitchens, gas interlock systems must be installed. More information on this can be found in the HSE – Gas safety in catering and hospitality document.
Gas interlock systems comprise of a gas interlock box with an emergency gas shut off button and a gas solenoid valve which is cut into the existing kitchen gas supply.
The interlock box has a current sensor that detects when the extract and intake fan are operating correctly and a direct wire feed to the gas solenoid valve.
With both fans operating a signal is sent to the gas solenoid valve to open.
This ensures that there can be no gas cooking unless the extraction is fully operational.
Ventilation of kitchens is now a key health and safety issue and the above ensures that kitchens operate within the CO2 regulations set out by Defra in their Guidance on the Control of Odour and Noise from Commercial Kitchen Exhaust Systems.