Commercial Twin-Walled Flue Installations
Safe, Compliant & High-Performance Flue Systems
At JLG Kitchens & Vent, we design and install commercial twin-walled flue systems for catering environments where safe removal of combustion gases is essential. Twin-walled flues provide insulated, high-temperature resistance and are suitable for gas, solid fuel and specialist cooking appliances, including pizza ovens. Our installations are carefully routed and installed to meet current commercial kitchen ventilation, fire safety and building regulations, ensuring safe operation, heat containment and long-term performance in demanding commercial settings.
Engineered for heat. Built for safety.
Twin-walled flue systems play a critical role in safely removing combustion gases while protecting surrounding structures from excessive heat. When correctly designed and installed, they ensure appliances operate efficiently while maintaining safe internal temperatures throughout the building.
Our flue installations are planned for real-world commercial use, not just theoretical compliance.
Twin-Walled Flue Systems for Commercial Catering Environments​
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Commercial kitchens using high-temperature appliances require flue systems designed specifically for intense heat and continuous operation. We design flue routes that suit the building layout, appliance type, and operational demands.
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Our flue design considerations include:
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Appliance type and heat output
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Internal and external routing requirements
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Safe clearances from combustible materials
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Vertical and horizontal run limitations
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Structural and weather protection requirements
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This ensures each flue system performs safely and efficiently over the long term.
Suitable for Gas, Solid Fuel & Specialist Appliances
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Twin-walled flues are commonly required for appliances that generate high heat or combustion gases.
We install flue systems to support:
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Gas-fired catering equipment
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Solid fuel and wood-fired appliances
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Pizza ovens and specialist cooking equipment
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High-temperature commercial ovens
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Catering appliances requiring insulated flue systems
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Each installation is tailored to the specific appliance and cooking method.
Integrated with Ventilation, Fire Safety & Building Systems
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Flue systems must work alongside kitchen ventilation and fire safety infrastructure. We coordinate flue installations with extraction systems, fire suppression, gas safety, and surrounding finishes to ensure full compatibility.
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We ensure:
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Safe integration with ventilation and extraction
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Proper fire-stopping and heat protection
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Secure fixing and support throughout the flue route
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Clean penetration through walls, ceilings, and roofs
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This coordinated approach supports compliance and safe operation.
Installed for Compliance, Reliability & Longevity
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Correct installation is essential for flue performance and safety. Our team installs twin-walled flue systems with careful attention to manufacturer guidance and best-practice standards.
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We focus on:
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Secure, load-bearing support systems
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Accurate alignment and sealing
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Safe termination points
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Access for inspection and maintenance
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This ensures flue systems remain safe, compliant, and reliable over time.
Twin-Walled Flue Installations Across Essex, London & the M25
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We provide commercial twin-walled flue design and installation services across Essex, London, Kent, and the wider M25 area, supporting restaurants, pizzerias, hospitality venues, and specialist catering operations.
If you are installing new high-temperature equipment or upgrading an existing flue system, our team can provide clear, professional guidance from design through to installation.
Next step:
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Contact our team to discuss your commercial twin-walled flue installation requirements and arrange a consultation.
Get a Quote
Ready to discuss your project?
Whether you need a full commercial kitchen installation or a specialist service, our team is here to help. Get in touch with JLG Kitchens & Vent for expert advice and a no-obligation quotation.
Frequently Asked Questions
Commercial Twin-Walled Flue Installations
What is a commercial twin-walled flue?
A twin-walled flue is an insulated flue system designed to safely discharge combustion gases from heat-producing appliances. It consists of an inner flue, an insulation layer, and an outer casing—allowing high-temperature exhaust to pass safely through buildings.
What is a twin-walled flue used for?
Twin-walled flues are used where appliances cannot discharge into a standard kitchen extraction system. They are common for:
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Pizza ovens
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Solid fuel appliances
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Certain gas appliances
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Installations without canopy extraction
They safely manage heat and combustion gases.
Is a twin-walled flue only used for pizza ovens?
No. While commonly associated with pizza ovens, twin-walled flues are also used for other solid fuel and gas appliances where direct flue discharge is required instead of grease ducting.
What fuels are twin-walled flues suitable for?
Twin-walled flue systems are suitable for:
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Wood-fired appliances
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Solid fuel (logs, pellets)
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Natural gas
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LPG
Flue specification depends on appliance type, fuel, and operating temperature.
What regulations apply to commercial twin-walled flue installations?
Twin-walled flue installations must comply with:
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Fire safety regulations
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Building regulations
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Manufacturer installation guidelines
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Appliance-specific standards
Correct clearances, fire ratings, and termination points are critical for compliance.
Are there technical standards for twin-walled flues?
Yes. Technical requirements include:
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Minimum distances to combustible materials
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Approved insulation thickness
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Correct flue diameter and height
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Fire-rated components
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Approved supports and brackets
All installations must follow manufacturer and regulatory guidance.
What ducting is required for a traditional pizza oven?
Traditional wood-fired pizza ovens usually require a dedicated twin-walled flue, not grease ducting. Grease ducting is designed for cooking vapours, while flues are designed for combustion gases and extreme heat.
Is a fan required on a twin-walled flue?
In many cases, yes. A flue fan may be required to:
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Improve draw
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Stabilise combustion
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Overcome long flue runs or height restrictions
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Ensure consistent exhaust performance
What types of fans are suitable for twin-walled flues?
Specialist high-temperature flue fans are required.
We fit Exodraft flue fans, which are purpose-designed for commercial flue systems and suitable for high-heat, solid fuel, and gas applications.
Where are flue fans typically installed?
Flue fans are usually roof-mounted or inline within the flue system. Placement depends on flue length, appliance output, and building layout.
How hot can a twin-walled flue get?
Twin-walled flues are designed to handle very high temperatures, often exceeding 400–600°C depending on appliance type. Insulation keeps outer surface temperatures within safe limits.
What fire rating does a twin-walled flue have?
Twin-walled flues are manufactured with certified fire ratings suitable for commercial use. The exact rating depends on the system specification and manufacturer approval.
Can a twin-walled flue pass through floors or roofs?
Yes. Twin-walled flues are designed to pass through floors, ceilings, and roofs when installed with correct fire-stopping, supports, and clearances.
Can twin-walled flues be installed in existing buildings?
Yes. Twin-walled flue systems are commonly retrofitted into existing buildings where new appliances are installed or compliance upgrades are required.
Can you assess an existing twin-walled flue installation?
Yes. Existing flue installations can be inspected to assess safety, compliance, condition, and performance.
Can you recommend improvements to an existing flue system?
Can you recommend improvements to an existing flue system?
How do I start a commercial twin-walled flue project?
The first step is a site survey. This allows appliance type, fuel, heat output, routing options, and compliance requirements to be assessed before design and installation.
Do you offer site surveys and quotations?
Yes. A free site survey and quotation is provided to assess your requirements and recommend a safe, compliant flue solution.
How much does a twin-walled flue installation cost?
Costs depend on flue length, diameter, routing complexity, fan requirements, and fire-stopping works. Correct specification at the start helps avoid costly changes later.
Who do you work with on flue projects?
We work closely with:
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Chefs and operators
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Architects and designers
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Engineers and installers
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Project managers
to ensure flue systems integrate safely and efficiently.
What areas do you cover for twin-walled flue installations?
Commercial twin-walled flue design, installation, and upgrades are available across London, Essex, and inside and around the M25.
Why choose a specialist for twin-walled flue installations?
Specialists understand extreme heat, fire safety, combustion behaviour, and compliance requirements. This ensures flue systems are engineered correctly, installed safely, and built to perform long-term under demanding conditions.