Commercial kitchen gas interlock systems

Gas interlock systems cut-off the gas flow in the event of fan failures - now a mandatory requirement

ACK gas interlock systems operate by monitoring the operation of fans within the ventilation system via sensors which are installed on either side of the ductwork to monitor air pressure.

Gas interlock systems

Gas Interlock Systems are a mandatory requirement for most commercial kitchens when installing a new canopy, a new cooker line or layout, and with fitting of Category ‘B’ equipment such as ovens, deep fryers etc., including replacements to an existing layout.

Gas Interlock Systems (GIS) and are designed to cut-off gas flow in the event of kitchen extraction fan failures. They also ensure that the air flow rates achieved by commercial kitchen extract systems meet the minimum standards as set out by DW/172.

They operate by monitoring the operation of fans within the ventilation system via sensors which are installed on either side of the ductwork to monitor air pressure. These sensors are connected to an air differential switch which is activated when the pressure difference changes. An alternative option is to monitor the current used by the fan with a fan power sensor. A 230V gas interlock system monitors the switch/sensor and should a fan failure occur the gas solenoid valve will be closed and cut-off the gas flow to appliances.

We take pride in the design of ventilation systems for our customers and understand the need for effective solutions, including accurate monitoring and gas shut-off with gas interlock systems. If you’re looking to upgrade or install a commercial kitchen our design team will work with you to understand your plans on what you will be cooking, the capacity of the equipment and any further plans you might have for future expansion. From this initial fact finding and planning stage we can design the ideal system including the GIS, that fits both your budget and requirements.

gas interlock system G02

Catalogue download

For further information on gas interlock systems download the latest ACK commercial kitchen ventilation systems catalogue. 

Gas safety in catering and hospitality

HSE Information Sheet No 23

Ventilation of kitchens and catering establishments

HSE Information Sheet No 10

Gas interlock system requirements

For an accurate and reliable GIS, all our ACK systems will include the control panel, air differential pressure switch, and the solenoid valve.  As an optional feature a manually operated emergency shut-off switch can also be specified.

gas interlock system merlin 1250

Control panel

gas interlock system air differential pressure switch

Air differential pressure switch

gas interlock system shut off solenoid valve

Solenoid valve

gas interlock system emergency switch

Emergency cut-off switch

Gas interlock system kitchen set-up


FPS are used as an optional detection and control device for extra system protection.


ADS switches are located in each flue duct to sense air movement and correct fan operation.

kitchen set-up for gas interlock system

Gas interlock system products

gas interlock system merlin 1250

Gas Interlock System Control Panel


Commercial Kitchen Gas Proving System

Gas Proving System

Current gas regulations require that any kitchen fitted with gas appliances which do not have flame safety devices are advised to install a gas proving system to comply with Gas Safe Register best practice.

GIS emergency switch

Cut-off Switch


GIS air differential pressure switch

Air Differential Pressure Switch

Includes 2 metres of piping

Commercial Kitchen Gas Interlock System Extension Kit

Extension Kit

Includes 2 metres of piping and 2 connectors

GIS shut off solenoid valve

Solenoid Gas Valves

SGV-240-1/2 (½")
SGV-240-3/4 (¾")
SGV-240-1 (1")
SGV-240-1-1/4 (1¼")
SGV-240-1-1/2 (1½")
SGV-240-2 (2")
SGV-240-2-1/2 (2½")
SGV-240-3 (3")

Commercial Kitchen 3 Phase Gas Interlock System Thermostats

3 Phase Thermostats

Hot cupboards +30-85°C
Hot water boilers +30-110°C
Fryers +110-190°C 
Convection ovens 60-260°C
Bratt pans 60-260°C
Boiler top / ovens 60-320°C

Commercial kitchen gas interlock system options

High performance ventilation systems are an essential demand of any reputable and compliant commercial kitchen for a clean, comfortable and safe working environment. As well as GIS, the systems we custom design and install for our customers comprise of many areas of expertise and options which, when combined give you the perfect kitchen.


Canopy Systems

commercial kitchen ductwork



Carbon Cell Filter Systems


Extractor Fans

commercial kitchen canopy filter icon

Canopy Filters

ventilation systems - kitchen odour control systems icon

Odour Control Systems

ventilation systems - kitchen make-up air system

Make-up Air Systems

ventilation systems - kitchen heat recovery system

Heat Recovery Systems

Ventilation HSE documents

Keeping you up to date with the latest commercial kitchen HSE regulations, DEFRA guidelines or other kitchen ventilation related specifications.

Need help finding an ACK product?

We hope you’re able to find everything you need while browsing our site. If you require any assistance finding a product, or wish to discuss any of our services please call or email our Chinese and English speaking sales and technical teams.  We look forward to helping you.

Scroll to Top