ATTACK KT chimney, diameter 80, PP

Product detailed description

ATTACK KT chimney, diameter 80, PP is part of the original exhaust and air intake system for wall-mounted condensing gas boilers ATTACK Condensing. This part belongs to the category: chimney – final roof element for a separate system, diameter 80 mm, material polypropylene (PP), exhaust and intake roof kit.

Closed combustion chamber and exhaust in condensing boilers ATTACK

With higher outputs or more complex exhaust routes (longer runs, more directional changes, shared chimney body for multiple boilers), the coaxial pipe 60/100 mm can no longer be used efficiently – the flow resistance would be too high and the boiler performance would be limited. Therefore, in these cases, a separate (double-pipe) system with a diameter of 80 mm is used, where air intake and exhaust are carried through two separate pipes, which can follow different routes (for example, exhaust above the roof and air intake through a side wall). This system is referred to in technical terminology as Ø80/Ø80 or C83/C93 according to the type of termination and is common in boiler cascades, for boilers with higher output, or where a greater distance to the facade or roof must be overcome.

Parts of the separate system ATTACK KT with a diameter of 80 mm are made of polypropylene (PP) – a material that is long-term resistant to acidic condensate formed during flue gas condensation, has low weight and low friction coefficient, which reduces pressure losses on longer routes. Since it is separate pipes, both (exhaust and intake) must be routed with the same slope and logic as coaxial pipe – exhaust gases must not accumulate in horizontal sections and condensate must always return by gravity towards the boiler or into a condensate trap.

Chimney kit Ø80 – termination of a separate system above the roof

This chimney kit forms the final element of the separate system Ø80/Ø80 at the roof penetration. Since it is two separate pipes (exhaust and intake), the part includes a complete kit for both branches including gutter collars and protective caps to prevent water and dirt from entering, which also explains the higher price compared to a simple coaxial chimney cap – essentially it is two caps and two penetrations in one assembly unit (or in close proximity if each branch is terminated separately).

Just like with coaxial termination, the minimum height above the roof plane and distances from windows and ventilation openings must be observed according to STN EN 15287. In the case of a separate system, it is also checked that the intake (suction) cap is not placed too close to the exhaust cap to prevent the suction of its own exhaust gases – the manufacturer therefore specifies in the manual the minimum mutual distance between both terminations if they are not led through a common chimney body.

Example of a typical connection in a real installation:
boiler → splitter 60/100→80/80 → two separate branches Ø80 → chimney kit Ø80 (roof penetration, exhaust and intake).

Step-by-step installation procedure

1. Determine the roof penetration locations for both branches (exhaust and intake) taking into account the minimum mutual distances according to STN EN 15287.
2. Mount the gutter collars of both caps so that they cover the roof covering in the range specified by the manufacturer.
3. Connect both caps to the respective vertical pipe branches, seal the joints and mechanically secure them.
4. Check that the intake cap is not located in the direction of the exhaust gas flow from the exhaust cap.
5. After the first rain following installation, check the watertightness of both penetrations from the attic.

Material and construction

The kit is made of polypropylene, which is long-term resistant to acidic condensate formed during flue gas condensation and at the same time withstands external weather influences (UV radiation, rain, frost) on the external part of the roof penetration. The low weight of the material facilitates handling during installation at heights.

System classification: separate (Ø80/Ø80). Finish: vertical, roof penetration.

Compatibility with ATTACK boilers

Part PR50 is intended for the connection system common to the entire range of wall-mounted condensing boilers ATTACK ACKT20, ACKT28 and ACKT48 (Condensing KT series), ATTACK KST24 (Condensing KST) and ATTACK KZT25 (Condensing KZT). Before ordering, we recommend verifying in the installation manual for the specific boiler model the exact type of connection flange and the maximum allowable exhaust route length, as it may vary slightly depending on the boiler output (20, 28 or 48 kW in the KT series).

Installation and warnings

Both caps (exhaust and intake) are installed with the minimum height above the roof plane and distances from surrounding structures according to STN EN 15287. The manufacturer usually also specifies the minimum mutual distance between both terminations if they are not led through a common chimney body, to prevent exhaust gases from being sucked back into the intake branch.

In general, horizontal exhaust sections must have a minimum slope of 3° towards the boiler or the nearest condensate trap to prevent condensate from accumulating in the pipe. Installation should be carried out by a person with professional qualifications for the installation of gas appliances and their exhaust systems, in accordance with the installation manual for the specific boiler and with the standard STN EN 15287.

Standards and safety requirements

The installation of exhaust systems for condensing boilers in Slovakia is primarily governed by the standard STN EN 15287 (Chimneys – Design, execution and acceptance of chimneys – Part 1: Chimneys for appliances with a fan), which sets minimum distances of the termination from windows, ventilation openings, adjacent properties and ground level, as well as the minimum height of the termination above the roof plane. The boiler itself and its exhaust system must also meet the requirements of STN EN 483 (gas boilers type C) and be installed in accordance with the applicable technical and operational regulations (TPP) for gas equipment.

Installation must be carried out only by a person with professional qualifications for the installation and servicing of gas appliances, who will issue a maintenance report or commissioning certificate after completion. In the case of any change in the route compared to the original approved design (e.g., additional extension of the route, change in the number of elbows), it is necessary to check whether the boiler is still within the parameters allowed by the manufacturer – otherwise, not only a boiler malfunction, but also loss of warranty and in the worst case a safety risk of flue gas leakage may occur.

Maintenance and service inspection

Both caps of the roof kit are recommended to be checked at least once a year, ideally before winter – especially the condition of the sealing collars and the passability of both grilles (exhaust and intake), since clogging of either of them affects the operation of the entire boiler.

The recommended inspection interval for the entire exhaust route is once a year, usually as part of the regular service inspection of the boiler carried out by an authorized service technician. At this time, this specific part is also checked, the passability of the condensate path and the overall condition of the connections along the entire route from the boiler to the termination outside the building.

Typical application scenarios

Scenario 1 – boiler cascade with a shared roof termination: multiple boilers share a separate system Ø80/Ø80 led to a common location on the roof, where the chimney kit solves the termination of the collector branch.

Scenario 2 – long route through multiple floors: when the separate system passes through multiple floors up to the roof, this kit solves the final roof penetration for both separate pipes.

Related parts in the ATTACK KT range

The chimney kit Ø80 continues from the pipes PR45 and splitters PR51/PR51A/PR51B, which bring both branches of the separate system up to the roof penetration. Compared to the coaxial cap PR39, it simultaneously solves the termination of two separate pipes instead of one shared one.

A complete overview of all parts of the exhaust system ATTACK KT / KT PLUS (elbows, extensions, chimney caps, condensate traps and splitters for diameters 60/100 mm and 80 mm) can be found in the category Condensing boilers > exhausts, flues > accessories for brands > Attack in this online store.

Summary

ATTACK KT chimney, diameter 80, PP (code PR50) is a chimney component – a final roof element for a separated system with a diameter of 80 mm, made of polypropylene (PP), exhaust and intake roof kit, belonging to the separated system (Ø80/Ø80). Recommended installation orientation: vertical, roof penetration. The component is intended for boilers ATTACK ACKT20, ACKT28 and ACKT48 (Condensing KT series), ATTACK KST24 (Condensing KST) and ATTACK KZT25 (Condensing KZT) and is part of a broader range of exhaust components from ATTACK KT available in this online store, allowing you to assemble a complete flue gas exhaust route precisely according to the layout of a specific installation.

Frequently Asked Questions

Why is the chimney kit Ø80 (PR50) more expensive than the coaxial chimney endpiece 60/100 mm (PR39)?
The PR50 kit solves the termination of both separate pipes of the separated system (exhaust and intake) including two sets of sealing collars and protective caps, while the coaxial endpiece PR39 solves only one shared pipe – the scope of material and work needed for complete termination is thus greater in the separated system.

Do both endpieces of the PR50 kit have to be led directly next to each other, or can they be separated?
According to the layout and boiler instructions, both endpieces can also be led separately (e.g., exhaust through the roof and intake through a side wall) – in such a case, components according to the specific route are used instead of the shared kit, while the minimum mutual distance of the terminations according to the standard must be maintained.

Do I need a chimney for the condensing boiler ATTACK?
No. Condensing boilers ATTACK Condensing KT, KST and KZT have a sealed combustion chamber with forced draft – they draw combustion air from outside and exhaust flue gases through their own exhaust system (coaxial 60/100 mm or separated Ø80/Ø80). Therefore, a masonry chimney is not necessary, a wall or roof penetration for a plastic-aluminum pipe is sufficient.

What is the maximum length of the flue gas exhaust with coaxial pipe 60/100 mm?
The exact value depends on the specific boiler model (ACKT20, ACKT28, ACKT48, KST24 or KZT25) and is stated in the installation instructions – usually it is an equivalent length of 10 – 15 m, where a 90° elbow is counted as approximately 1 – 1.5 m and a 45° elbow as approximately 0.5 m of straight pipe. Exceeding the limit increases resistance and may cause the boiler to report a fault.

Why does water drip from the flue gas exhaust?
The condensing boiler cools the flue gases so much that the water vapor contained in them condenses – it is precisely this additional heat that the boiler gains its high efficiency. The resulting condensate is slightly acidic and must be drained via a condensate trap into the boiler’s siphon; therefore, all horizontal sections of the pipe are required to have a slope towards the boiler or the condensate trap.

Can the coaxial pipe 60/100 mm be combined with a separated system Ø80/Ø80?
Yes, precisely for this purpose a splitter is used (e.g., PR51, PR51A or PR51B), which splits one coaxial pipe from the boiler into two separate pipes Ø80 mm. It is used for longer routes or when the intake and exhaust need to be led in different directions.

Can I combine parts of different diameters or from another manufacturer with the exhaust system ATTACK?
It is recommended to use a certified system from the same manufacturer stated in the instructions for a specific boiler (for ATTACK Condensing boilers, it is the ATTACK KT/KT PLUS system). Combining parts of different diameters, materials or from other manufacturers may mean leaks, improper condensate drainage and loss of boiler warranty.

How often should the exhaust pipe and condensate trap be checked?
It is recommended to visually check the tightness of the joints and the passability of the condensate trap at least once a year, ideally during the regular service inspection of the boiler. In the case of facade or roof termination, it is also necessary to check whether the mesh of the endpiece is not clogged with leaves, insects or snow.

Is it necessary to insulate the flue gas exhaust?
When leading the exhaust through a heated room, insulation is usually not necessary, since the surface temperature of the coaxial pipe is low. For longer sections led through an unheated room (attic, facade) or in the case of a risk of condensation on the pipe surface, additional insulation is recommended, especially at the condensate trap location, to prevent freezing.

What happens if the flue gas exhaust is undersized or too long?
The boiler usually reports a fault related to the flow of flue gases/air (fan, pressure switch or flue gas path fault) and shuts down for safety reasons when the maximum equivalent length of the exhaust is exceeded or there are leaks. The solution is to recalculate the route according to the instructions and possibly modify it (shorter route, fewer elbows, or switching to a separated system Ø80/Ø80).

Can this component be used in a cascade connection of multiple boilers?
In cascades with multiple boilers, a separated system Ø80/Ø80 with a common collecting chimney is usually used, or separate endpieces for each boiler according to the cascade project documentation. Specific components (extensions, elbows, splitters) are compatible in this configuration as well, but the minimum distances of the terminations according to STN EN 15287 must be observed.

How can I find out which parts I exactly need for my installation?
The most reliable way is to refer to the installation instructions for a specific boiler model (ACKT20/28/48, KST24, KZT25), which contain typical connection diagrams and maximum allowed lengths. In the case of a more complex or atypical layout (long route, passage through multiple floors, cascade), we recommend consulting with an installation company or directly with the seller before ordering the exact number of pieces.

Must the condensate from the flue gas exhaust be neutralized before being discharged into the sewer?
In the case of ordinary single-family houses with a small boiler output, neutralization is usually not required due to the small amount of condensate and its dilution with other wastewater, but it is necessary to follow the current legislation and the requirements of the sewerage operator in the given location. In the case of higher outputs or boiler cascades, it is recommended to install a condensate neutralization device before discharging into the public sewer.

Is the operation of a condensing boiler with this type of exhaust noisier than with a classic chimney?
Forced draft (boiler fan) may be associated with slight operational noise, but it is minimal when the route is properly installed and mechanically secured (without freely vibrating pipe sections) and is usually comparable or lower than the noise of a classic atmospheric boiler with exhaust through a chimney.

Can the installation of this component be done by oneself, or is a professional required?
The mechanical connection of the parts (push-fit system) is simple, but connecting the exhaust to the condensing boiler, calculating the maximum route length and commissioning the boiler must be performed by a person with professional qualifications for the installation of gas appliances – this is a condition of the manufacturer and a legal requirement to maintain the warranty and ensure safe operation.

Does the number and type of these parts affect gas consumption or boiler efficiency?
They do not directly affect consumption, but indirectly they do – the higher the resistance of the exhaust route (many elbows, a long route at the limit), the more energy the boiler fan must expend to overcome this resistance and the sooner the boiler may limit performance or report a fault. Therefore, designing a route with the minimum necessary number of parts is also suitable from the perspective of operational efficiency.

Warranty

This exhaust system component from ATTACK is covered by a warranty of 24 months from the date of shipment from the warehouse, the same as for other accessories for ATTACK condensing boilers. In the case of a complaint, we recommend keeping the purchase receipt and, if necessary, also photographic documentation of the installation method, since the functionality of exhaust systems is closely linked to the correctness of the installation (slope, maximum route length and distances according to the instructions must be observed).