Vaillant flue extension 0.5 m, Ø 110 mm

Product detailed description

Vaillant flue extension 0.5 m, Ø 110 mm (shaft system)

This single-wall pipe with a length of 0.5 m is designed for the so-called shaft system of flue gas discharge, where flue gases are routed through a single Ø 110 mm pipe placed in an existing vertical building shaft or chimney, while combustion air for the boiler is drawn from the free annular space between the pipe and the shaft walls. Unlike the concentric Ø 110/160 mm system (where air and flue gases are carried by a single coaxial pipe), here the combustion air flows outside the pipe itself, directly in the shaft space – therefore this part is used exclusively in combination with an airtight sealed shaft with an external air supply at its bottom or top section, according to the project design.

The part is combined with other lengths (0.5 m and 1.0 m) and directional components to achieve the exact length of the vertical route in the shaft, with transition and support components connected at the top and bottom of the assembly for connection to the boiler and to the shaft outlet, respectively.

Summary of technical parameters

• Part type: Extension (shaft system, single-wall)
• Diameter: Ø 110 mm
• System: Shaft (LAS) – single-wall pipe, air flows freely in the shaft
• Length: 0.5 m
• Material: Polypropylene (PP), condensate resistance class W
• Temperature class: T120
• Pressure class: P1
• Joint type: Bayonet lock with rubber seal
• Intended for: Higher-output ecoTEC plus, ecoCRAFT exclusiv, ecoVIT exclusiv – installation in shaft
• Country of origin: Germany / EU
• Brand: Vaillant
• Warranty: 24 months

Vaillant Ø 110 mm shaft system (LAS)

The single-wall Ø 110 mm pipe is designed for the so-called shaft flue gas system (also commonly referred to by the abbreviation LAS – an air-flue gas system via a shaft), where flue gases are discharged through a single pipe placed in an existing masonry or prefabricated shaft/chimney, while combustion air for the boiler is drawn from the free annular space between this pipe and the shaft walls. This type of connection is used mainly for larger Vaillant gas condensing boilers (higher-output ecoTEC plus, ecoCRAFT exclusiv, ecoVIT exclusiv) installed in apartment buildings, boiler rooms and plant rooms, where a vertical building shaft is available and it is not desirable to run a separate concentric system through the façade.

The pipe is made of polypropylene (PP) with high resistance to condensate and acidic flue gas components (class W according to EN 14471), temperature class T120, pressure class P1. Joints are made using a locking socket system with a rubber seal, which ensures reliable gas-tightness on vertical and slightly inclined runs in the shaft. Since the system operates in both negative and positive pressure modes depending on the boiler type, every component must be from the certified Vaillant range – combining it with non-original parts from other manufacturers is not permitted and violates the CE certification conditions of the whole assembly as well as the boiler warranty.

Comparison of systems with and without an existing shaft

Besides the concentric (double-wall) systems Ø 60/100, 80/125 and 110/160 mm, Vaillant also offers a single-wall Ø 110 mm solution for shaft (LAS) installation, which includes this part. While concentric systems carry both flue gases and combustion air in a single coaxial pipe and are suitable especially where the route runs through a façade or free space without an existing shaft, the single-wall shaft system uses an existing building shaft as a natural air duct around the flue gas pipe. The choice between the two approaches depends on the layout of the specific building – in renovations with an available original chimney shaft, the shaft system is usually the structurally simpler and cheaper option, while in new buildings without such a shaft, the concentric system is almost always chosen instead.

Compatibility

The 0.5 m Ø 110 mm extension is designed exclusively for the Vaillant shaft (LAS) flue gas system, where flue gases are carried by this single-wall pipe and combustion air flows freely in the space around it within an existing building shaft. It is used with the same boiler models as the concentric Ø 110/160 mm system (higher-output ecoTEC plus, ecoCRAFT exclusiv, ecoVIT exclusiv), but differs in the method of combustion air supply – these two systems should not be combined without a transition part specifically designed for this purpose.

Typical usage scenarios

This short part is used for fine adjustment of the exact length of the vertical route in the shaft, when the remaining distance after combining longer extensions (1.0 m) does not correspond to a whole multiple – the 0.5 m variant allows precise adjustment to the required height without any need for on-site cutting of the pipe.

How to choose between the shaft and concentric system

Choose the Ø 110 mm shaft system (this part) when the building has a suitable existing vertical building shaft with a defined combustion air supply – typically in renovations of apartment buildings with an original chimney structure. If no such shaft is available, or the route is to run through the façade, the choice is the Ø 110/160 mm concentric system, where a single pipe carries both flue gases and combustion air without the need for an existing shaft.

Installation and use

The 0.5 m extension is inserted into the vertical route in the shaft using the same bayonet lock with seal as in the concentric system. During installation, it is necessary to:

• verify that the shaft meets the requirements for combustion air supply (free, unobstructed space, sufficient cross-section around the pipe, airtight separation from other areas of the building according to the project),
• continuously stabilize the pipe in the shaft using spacer holders or clamps so that a free cross-section for air flow is maintained all around,
• maintain the minimum slope towards the boiler for condensate drainage,
• before commissioning, check the tightness and functionality of the air supply through the shaft according to the installation manual for the specific boiler model,
• keep access to the inspection elements of the assembly (inspection T-piece, inspection section) in the lower part of the shaft for regular chimney sweep inspections.

Safety notices

Installation of the shaft (LAS) flue gas system requires, in addition to a professional installation company, a prior assessment of the structural condition and suitability of the shaft by an authorized technician – an incorrectly dimensioned or leaking combustion air supply through the shaft may endanger the safe operation of the boiler. Use only original Vaillant parts of the corresponding diameter; combination with non-original parts or unauthorized modification (such as cutting the pipe) is not permitted and violates the certification of the whole assembly as well as the boiler warranty. After installation or any intervention in the route, a check of the tightness and functionality of the air supply is required before putting the boiler into operation.

Maintenance and care

We recommend checking the flue system at least once a year during regular boiler servicing – especially the tightness of joints, the passability of condensate drainage (if part of the assembly), and mechanical fastening along the entire route. External plastic parts (roof terminals, wall sleeves) should be visually inspected after the winter season for possible mechanical damage caused by ice or wind. Under normal operation, the inside of the pipes does not become fouled with deposits the way traditional solid fuel chimneys do, but the inspection elements in the assembly (inspection bends, inspection sections, T-pieces) are precisely there so that a service technician can easily look inside the pipe during inspection and clean it if necessary without having to dismantle the entire route.

For boilers with a longer flue route, we recommend keeping a simple service record of the date of the last tightness check and the condition of the inspection openings – this makes it easier to plan further chimney sweep inspections and provides an overview in case of a warranty claim or property sale.

Why buy this part at Atria.sk

We offer exclusively original Vaillant parts with 100% compatibility with this brand's flue systems – no universal replacements of questionable quality, which could compromise the gas-tightness of the whole assembly or void the boiler warranty. Goods are usually in stock or quickly available from the supplier, so the completion of a boiler room installation or a service intervention is not delayed by a single missing part. If you are unsure which exact part you need for your assembly, we are happy to advise you by phone or e-mail – just provide the boiler model and the length of the flue route you need to bridge.

We normally process orders within one business day and dispatch in-stock goods immediately. If you are not sure which exact part your project requires (for example when combining several lengths and elbows into one route), we are happy to help you choose the correct assembly before ordering – just send us a floor plan or a photo of the installation site along with the boiler model.

Frequently asked questions