PAST PROJECTS
FIREPLACES
Built-in fireplace inserts by Thermia
Thermia Adastra 500
Built-in wood-burning fireplace insert by Thermia with glass on three sides, so the flame shows from the front and both sides. Made for a peninsula or a free-standing fireplace column. Thermal-concrete firebox, logs up to 40 cm. Dimensions (W × H × D) 553 × 1476 × 731 mm, weight 267 kg. Flue connection Ø200 mm, external air Ø150 mm, front glass 453 × 483 mm. Efficiency 80.5%. Tested to DIN EN 13229 and BImSchV stage 2. Rated output on request.
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Technical specs
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Glass
Three-sided
Rated output
On request
Efficiency
80.5%
Dimensions (W × H × D)
553 × 1476 × 731 mm
Weight
267 kg
Flue connection
Ø200 mm
External air
Ø150 mm
Max. log length
400 mm
Front glass (H × W)
453 × 483 mm
Side glass (H × W)
453 × 460 mm
Firebox lining
Thermal concrete
Standard
DIN EN 13229; BImSchV stage 2
SKU
A15-554000.R00
Thermia Adastra 600
Built-in wood-burning fireplace insert by Thermia with glass on three sides, so the flame shows from the front and both sides. Made for a peninsula or a free-standing fireplace column. Thermal-concrete firebox, logs up to 44 cm. Dimensions (W × H × D) 653 × 1476 × 731 mm, weight 264 kg. Flue connection Ø200 mm, external air Ø150 mm, front glass 453 × 582 mm. Efficiency 80.1%. Tested to DIN EN 13229 and BImSchV stage 2. Rated output on request.
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Technical specs
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Glass
Three-sided
Rated output
On request
Efficiency
80.1%
Dimensions (W × H × D)
653 × 1476 × 731 mm
Weight
264 kg
Flue connection
Ø200 mm
External air
Ø150 mm
Max. log length
440 mm
Front glass (H × W)
453 × 582 mm
Side glass (H × W)
453 × 360 mm
Firebox lining
Thermal concrete
Standard
DIN EN 13229; BImSchV stage 2
SKU
A15-553000.R00
Thermia Adastra 700
Built-in wood-burning fireplace insert by Thermia with a wide, low viewing window and glass on three sides, so the flame shows from the front and both sides. Made for a peninsula or a free-standing fireplace column. Thermal-concrete firebox, logs up to 52 cm. Dimensions (W × H × D) 728 × 1239 × 515 mm, weight 225 kg. Flue connection Ø159 mm, external air Ø125 mm, front glass 340 × 664 mm. Efficiency 80.4%. Tested to DIN EN 13229 and BImSchV stage 2. Rated output on request.
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Technical specs
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Glass
Three-sided
Rated output
On request
Efficiency
80.4%
Dimensions (W × H × D)
728 × 1239 × 515 mm
Weight
225 kg
Flue connection
Ø159 mm
External air
Ø125 mm
Max. log length
520 mm
Front glass (H × W)
340 × 664 mm
Side glass (H × W)
340 × 240 mm
Firebox lining
Thermal concrete
Standard
DIN EN 13229; BImSchV stage 2
SKU
A15-552000.R00
Thermia Adastra 800
The widest Adastra: a built-in wood-burning fireplace insert by Thermia with glass on three sides, so the flame shows from the front and both sides. Made for a peninsula or a free-standing fireplace column. Thermal-concrete firebox, logs up to 65 cm. Dimensions (W × H × D) 855 × 1471 × 630 mm, weight 350 kg. Flue connection Ø200 mm, external air Ø150 mm, front glass 447 × 789 mm. Efficiency 80.1%. Tested to DIN EN 13229 and BImSchV stage 2. Rated output on request.
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Technical specs
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Glass
Three-sided
Rated output
On request
Efficiency
80.1%
Dimensions (W × H × D)
855 × 1471 × 630 mm
Weight
350 kg
Flue connection
Ø200 mm
External air
Ø150 mm
Max. log length
650 mm
Front glass (H × W)
447 × 789 mm
Side glass (H × W)
447 × 357 mm
Firebox lining
Thermal concrete
Standard
DIN EN 13229; BImSchV stage 2
SKU
A15-546000.R00
Thermia Integra (left)
Corner wood-burning fireplace insert by Thermia with L-shaped glass on the front and the left side; the right side is solid steel and sits against the wall. Rated output 8 kW, efficiency 80.1%. Vermiculite firebox, logs up to 40 cm. Dimensions (W × H × D) 677 × 1200 × 510 mm, weight 99 kg. Flue connection Ø200 mm, external air Ø120 mm, front glass 318 × 587 mm, side glass 318 × 328 mm. Tested to DIN EN 13229 and BImSchV stage 2.
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Technical specs
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Glass
Corner (left)
Rated output
8 kW
Efficiency
80.1%
Dimensions (W × H × D)
677 × 1200 × 510 mm
Weight
99 kg
Flue connection
Ø200 mm
External air
Ø120 mm
Max. log length
400 mm
Front glass (H × W)
318 × 587 mm
Side glass (H × W)
318 × 328 mm
Firebox lining
Vermiculite
Standard
DIN EN 13229; BImSchV stage 2
SKU
A15-50300L.R00
Thermia Integra (right)
Corner wood-burning fireplace insert by Thermia with L-shaped glass on the front and the right side; the left side is solid steel and sits against the wall. Rated output 8 kW, efficiency 80.1%. Vermiculite firebox, logs up to 40 cm. Dimensions (W × H × D) 677 × 1200 × 510 mm, weight 99 kg. Flue connection Ø200 mm, external air Ø120 mm, front glass 318 × 587 mm, side glass 318 × 328 mm. Tested to DIN EN 13229 and BImSchV stage 2.
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Technical specs
+
Glass
Corner (right)
Rated output
8 kW
Efficiency
80.1%
Dimensions (W × H × D)
677 × 1200 × 510 mm
Weight
99 kg
Flue connection
Ø200 mm
External air
Ø120 mm
Max. log length
400 mm
Front glass (H × W)
318 × 587 mm
Side glass (H × W)
318 × 328 mm
Firebox lining
Vermiculite
Standard
DIN EN 13229; BImSchV stage 2
SKU
A15-50300D.R00
Engineered for Your Business
For Chimney & Fireplace Professionals
For Prefabricated & Timber Frame Builders
Integrate safety and efficiency into your homes. Lightweight, modular INOX systems are ideal for timber frame construction, minimizing structural load and enabling rapid on-site assembly. With certified low distances to combustible materials and designs that support modern building standards, our systems are the perfect fit for energy-efficient housing.
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The Fumex Service Commitment
World-class products backed by decades of hands-on expertise.
Expert System Consultation: Our specialists analyze your project’s technical and budgetary requirements to recommend the optimal system, ensuring performance and value.
Precision Installation & Commissioning: Our teams, backed by 45+ years of experience, ensure every system is installed to exacting standards and complies with all local building regulations.
Specialized Renovation Services: We are experts in the relining and upgrading of existing chimneys, utilizing advanced products like Schiedel TecnoFlex to solve complex challenges with minimal disruption.
Custom Fabrication: For unique architectural designs, our in-house workshop can fabricate bespoke stainless steel components to ensure a perfect fit and seamless integration.
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✓ Unrivaled Quality: Exclusive access to world-leading, fully certified INOX chimney systems.
✓ Strategic Project Value: Premium technology priced to maximize your ROI through lower installation and lifetime ownership costs.
✓ Decades of Proven Expertise: A foundation of over 45 years of specialized, hands-on chimney installation and fabrication service.
✓ Guaranteed Performance: Systems backed by the industry’s most robust certifications and guarantees, including options for lifetime coverage.
✓ A True Partner for Installers & Builders: From initial technical consultation to final commissioning, we are your dedicated, expert partner.
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Ready to Elevate Your Next Project?
Discuss your requirements with a Fumex system expert today. We will provide a detailed, no-obligation analysis and quote tailored to your project's specific needs, timeline, and budget.
The range
Our INOX Chimney Systems
An INOX chimney system is a stainless steel flue, usually twin-wall and insulated, assembled from prefabricated components rather than built from masonry. Three Schiedel systems cover almost every situation — the choice is driven by the appliance, and by whether you are building new or working with an existing chimney.
Schiedel ICS
The universal system. Twin-wall insulated and approved for all standard fuels, with push-fit jointing that cuts on-site assembly time. Its 316L liner is the only one of its type to have passed the GASTEC corrosion test. Internal diameters 80–1200 mm, rated to 600 °C.
It is specified for wood, pellet, gas and oil appliances alike, in new construction and in retrofit work where an existing building needs a new external or internal flue.
Push-fit jointing cuts labour hours. The simple push-fit jointing system dramatically reduces on-site assembly time compared with bolted or clamped alternatives, lowering the labour cost of every project.
316L liner with proven corrosion resistance. ICS is the only system of its type to have passed the GASTEC corrosion test, delivering exceptional durability across the full range of approved fuels.
Certified and guaranteed. ICS is EN certified and available with guarantee options up to ten years, giving specifiers and building control a documented basis for sign-off.
Internal diameters 80–1200 mm, external 130–750 mm. Liner 1.4404 (316L), outer casing 1.4301 (304), mineral fibre insulation at 25 or 50 mm.
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Schiedel ICID Plus
Engineered for high-efficiency appliances — pellet, biomass and condensing boilers. The inner liner expands independently under thermal stress, twist-lock jointing gives exceptional rigidity, and the system is rated for positive pressure. Ten year guarantee.
Modern high-efficiency heating puts a chimney under conditions older flues were never designed for: lower flue gas temperatures, heavier condensate loads, and positive pressure in the flue. ICID Plus answers all three.
Independent liner movement. The inner liner expands and contracts independently of the outer skin, eliminating the stress concentrations that cause joint failure in rigidly coupled systems.
Twist-lock jointing. The secure twist-lock joint provides exceptional rigidity and a positive mechanical connection, making the assembled flue stable enough for long vertical runs.
Positive pressure ready. Rated for positive-pressure applications (P1), which future-proofs the installation against a later change of appliance.
Typical applications: pellet stoves and boilers, wood chip and biomass plant, gas and oil condensing boilers, and integrated building systems where the flue passes through occupied floors.
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Schiedel TecnoFlex
The problem-solver for relining. A twin-skin flexible liner that negotiates bends and offsets in existing masonry chimneys without demolition, with a smooth inner wall that improves condensate drain-down. Available in 316L and 904L, ten year guarantee.
Most existing masonry chimneys are not straight. They dogleg around structural elements, change direction between floors, and narrow unpredictably. A rigid liner either will not pass, or requires opening up the stack.
Navigates bends and offsets. The flexible twin-skin construction follows the existing flue path through bends and offsets that a rigid system cannot negotiate.
Smooth inner wall. An exceptionally smooth inner wall improves condensate drain-down and reduces soot build-up, lengthening the interval between sweeps.
Interlocking joint that will not separate. The engineered joint ensures the liner cannot pull apart during installation — the most common failure mode when drawing a liner down a long stack.
Specify 316L for standard fuels, or 904L where the appliance or fuel produces an unusually aggressive condensate. Both carry a ten year guarantee.
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Quick comparison
Schiedel ICS
All standard fuels · new build and retrofit · push-fit jointing
Schiedel ICID Plus
Pellet, biomass and condensing · positive pressure (P1) · twist-lock
Schiedel TecnoFlex
Relining existing masonry · flexible · 316L or 904L
Internal diameters
80 – 1200 mm
Max. flue gas temperature
≤ 600 °C
Guarantees
Options up to ten years
Coverage
Slovenia and the European Union
What we do
Relining and Prefabricated Construction
Two areas where a specialist makes the difference between a system that is merely compliant and one that is right for the building.
Chimney relining and renovation
We reline and upgrade existing masonry chimneys across Slovenia and the EU. Survey and camera inspection, specification, installation drawn from the chimney head, then commissioning and documentation for building control. Most single-flue domestic relines take one day, with no demolition and no internal making good — which is what makes it viable in occupied and historic buildings.
An existing masonry flue usually needs lining when the appliance changes, when the flue leaks, or when condensate and tar have begun to damage the brickwork. A new wood burner or pellet stove fitted into an unlined older stack is the most common case we see.
Survey and camera inspection. We confirm the flue’s true path and the largest diameter that can realistically be achieved, and identify anything that has to be dealt with before lining.
Specification. We select between flexible TecnoFlex and a rigid INOX system based on the flue path, the appliance and the fuel, and specify the liner grade to match the condensate.
Installation. The liner is drawn from the chimney head, the void insulated where required, and the head weathered and capped.
Commissioning and documentation. We commission the system and hand over what building control and your insurer will ask for.
Because the liner is installed from the chimney head downwards, relining rarely requires opening up the stack. That makes it viable in occupied homes, in listed and historic buildings, and in hotels and apartment blocks where taking a building out of use is not an option.
Chimney systems for prefabricated and timber frame homes
A masonry chimney is a poor fit for factory-built housing: too heavy, built wet on a dry site, and slow at exactly the wrong point in the programme. Lightweight INOX systems weigh 4.4–22.4 kg/m against several hundred for masonry, carry certified low distances to combustible materials, and assemble dry. For repeating house types we specify once and supply to a fixed parts list per unit.
A masonry chimney is a poor fit for a timber frame or prefabricated house. It is heavy enough to require its own foundation, it is built wet on a dry site, and it takes days of trade time at exactly the point in the programme where speed matters most.
Minimal structural load. Lightweight twin-wall INOX systems impose a small fraction of the dead load of masonry — roughly 4.4 to 22.4 kg per metre against several hundred — so the floor and roof structure does not need designing around the chimney.
Certified distances to combustibles. Our systems carry certified low distances to combustible materials, the governing constraint in timber frame construction and the detail building control will check first.
Rapid dry assembly. Push-fit and twist-lock jointing means no wet trades, no curing time and no weather dependency — the chimney stops being a critical path item.
Suits energy-efficient housing. Designs support modern building standards and airtightness strategies, including room-sealed and balanced-flue configurations where required.
For repeating house types we specify the system once, agree the penetration and fire-separation details with your technical team, then supply to a fixed parts list per unit — which removes specification risk and makes the cost predictable per house.
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Company
About Fumex
Fumex d.o.o. is a specialist chimney systems supplier and contractor. We combine sales, installation and technical consulting for new construction and renovation, working exclusively with Schiedel, Jeremias and Diminox across Slovenia and the European Union.
45+ years of installation
Our service legacy in chimney installation and fabrication goes back more than 45 years. That history is why we can specify confidently for unusual buildings and awkward flue paths. We are both a specialist store and a contractor — and that combination is the reason our specifications tend to survive contact with the site: the people selecting the system are the people who have installed it.
In-house fabrication
For unique architectural designs, our own workshop fabricates bespoke stainless steel components so the system fits the building rather than the other way round.
Renovation specialists
We are experts in relining and upgrading existing chimneys, including listed, historic and occupied buildings where disruption has to be kept to a minimum.
Brands and certification
We work exclusively with trusted materials from Schiedel, Jeremias and Diminox, and do not stock unbranded or uncertified components. Our systems are EN certified, with guarantee options up to ten years depending on the system specified.
Answers
Frequently Asked Questions
What is an INOX chimney system?
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A stainless steel flue assembled from prefabricated components, usually twin-wall with insulation between the skins. It replaces a masonry chimney and is significantly lighter, faster to install and easier to match precisely to the appliance.
Which Schiedel system should I choose?
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ICS for general-purpose new build and retrofit with standard fuels, ICID Plus for condensing and biomass appliances or where positive pressure is involved, and TecnoFlex when relining an existing masonry chimney that has bends or offsets.
Can a stainless steel chimney be used in a timber frame house?
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Yes. Insulated twin-wall INOX systems are the standard solution for timber frame and prefabricated construction, precisely because they are light and carry certified minimum distances to combustible materials.
Do you have to demolish the chimney to reline it?
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In almost all cases, no. The liner is drawn down from the chimney head, so the stack stays intact and there is no internal making good afterwards.
How long does a chimney reline take?
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A typical single-flue domestic reline is completed in one day. Multi-flue and commercial stacks are programmed individually after survey.
What is the maximum flue gas temperature?
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Schiedel ICS is rated to a maximum flue gas temperature of 600 °C. Other systems in the range are rated to suit the appliances they are designed for.
Does Fumex supply only, or install as well?
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Both. We supply installers and builders who fit the system themselves, and we also plan, install and commission complete systems with our own teams.
Do you work outside Slovenia?
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Yes. Fumex operates in Slovenia and throughout the European Union.
How much does chimney relining cost?
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Cost depends on the height of the stack, the liner diameter and grade, and how difficult the flue path is. We quote a fixed price after survey — send photographs and an approximate height for an initial estimate.
Does a new wood burner need a lined chimney?
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In most cases yes. An unlined masonry flue is usually oversized and porous for a modern appliance, which causes poor draught, tarring and a real risk of leakage into the building.
What is the difference between Schiedel ICS and ICID Plus?
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ICS is the universal system for all standard fuels, with push-fit jointing and a focus on fast installation. ICID Plus is engineered for high-efficiency condensing and biomass appliances: independently expanding inner liner, twist-lock jointing and a positive-pressure rating.
Do you supply repeating house types?
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Yes. For repeating prefabricated types we specify once and then supply to a fixed parts list per unit, so cost and lead time are predictable across the programme.
Who is responsible for the fire separation detail?
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We agree the penetration and separation detail with your technical team before the first unit is built, and provide the certified distances and documentation your building control body will ask for.
Which manufacturers does Fumex work with?
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We work exclusively with Schiedel, Jeremias and Diminox, and do not stock unbranded or uncertified components.
Do you quote without a site visit?
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For straightforward new-build work, yes — drawings and appliance details are usually enough. For relining and renovation we survey first, because the achievable flue diameter cannot be guessed reliably.
How quickly do you respond to enquiries?
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We aim to respond to technical enquiries within one working day, with either a specification or the questions we need answered to produce one.
What to send us
The more of this you can give us up front, the more precise the first answer will be: the appliance make and output, the building type and construction, the approximate flue height and route, and photographs of the existing stack if there is one. For repeating prefabricated house types, send the house type drawing and we will specify once and quote per unit.
Company
Fumex d.o.o.
Cesta II. grupe odredov 13c
1261 Ljubljana, Slovenia
VAT ID: SI44190131
Reg. no.: 7325266000