The Merlin CT1200S acts as an interlock between the ventilation system and the gas solenoid valve. This system can work in conjunction with both external current monitors and air pressure differential switches in order to interlock with up to 2 fans.
 
The Merlin CT1200S ventilation interlock system is designed specifically for use in commercial kitchens to meet BS6173. This panel is to be used when the kitchen appliances do have flame failure devices, therefore Gas proving is not a requirement.
 
Ventilation interlock system which isolates the fuel supply if the ventilation fails
Monitor up to 2 extract or supply fans
Gas Isolation
 
For more infomation on the regulations