ATTACK KT exhaust and intake pipe 1 m, diameter 80, PP

Product detailed description

ATTACK KT exhaust and intake pipe 1 m, diameter 80, PP is part of the original flue gas discharge and combustion air intake system ATTACK KT / KT PLUS, designed for wall-mounted condensing gas boilers ATTACK Condensing. This component belongs to the category: exhaust or intake pipe 1000 mm, diameter 80 mm, made of polypropylene (PP).

Closed combustion chamber and flue gas discharge in ATTACK condensing boilers

At higher outputs or with more complex discharge routes (longer runs, more direction changes, shared chimney for multiple boilers), a coaxial pipe of 60/100 mm can no longer be used efficiently – the flow resistance would be too high and the boiler output would be limited. That's why in these cases a separate (twin-pipe) system with a diameter of 80 mm is used, where air intake and flue gas discharge run through two separate pipes, which can even follow different routes (for example, flue gas discharge above the roof and air intake through a side wall). This system is technically referred to as Ø80/Ø80 or C83/C93 depending on the outlet configuration, and is common with boiler cascades, higher-output boilers, or where a greater distance to the facade or roof must be covered.

The components of the separated ATTACK KT system with a diameter of 80 mm are made of polypropylene (PP) – a material that is long-term resistant to the acidic condensate produced during flue gas condensation, has low weight and a low friction coefficient, which reduces pressure losses over longer runs. Since these are separate pipes, both (exhaust and intake) must be routed with the same slope and the same logic as coaxial pipes – flue gases must not accumulate in horizontal sections, and condensate must always flow back by gravity toward the boiler or into the condensate trap.

Ø80 pipe – structural component of the separated system

This 80 mm diameter pipe is used universally in the separated system – the same component serves to extend both the intake branch (combustion air intake) and the exhaust branch (flue gas discharge), since both pipes in the Ø80/Ø80 system have the same diameter and material. By combining multiple 1 m pieces, the exact length of both branches can be adjusted according to the room layout and route to the roof or facade – just as with the coaxial system, the sum of the lengths of straight sections and the equivalent lengths of elbows must not exceed the maximum specified in the manual for the specific boiler (for the separated system, this is generally significantly higher, since pressure losses with two separate Ø80 pipes are lower than with a coaxial 60/100 mm duct).

When installing multiple pieces in a row, the same slope (min. 3° toward the boiler or condensate trap) must be maintained on the exhaust branch so that condensate does not remain in the pipe, and mechanical fastening with clamps must be done at intervals according to the manual, since longer horizontal sections of PP pipe without support may sag over time.

Component length: 1000 mm.

Example of a typical connection in a real installation:
boiler → distributor 60/100→80/80 → Ø80 pipe (exhaust) + Ø80 pipe (intake) → both branches continue to the chimney terminals.

Step-by-step installation procedure

1. Calculate the required number of metre-long pieces separately for the exhaust and intake branches according to the actual route length.
2. Connect the components using the plug-in system, checking the correct insertion direction according to the markings.
3. On the exhaust branch, maintain a slope of at least 3° toward the boiler or condensate trap along the entire length.
4. Support longer sections with clamps at intervals according to the installation manual so that the pipe does not sag over time.
5. After connecting both branches, check the tightness of the joints along the entire route.

Material and construction

Polypropylene is a material that is long-term resistant to the acidic condensate produced during condensation of water vapour from flue gases – unlike metal materials, it does not corrode even with permanent contact with low-pH condensate. It also has low weight, which simplifies installation over longer routes, and a low friction coefficient on the inner surface, resulting in lower pressure losses over longer sections compared to metal pipes of a comparable diameter.

System classification: separated (Ø80/Ø80). Configuration: vertical and horizontal.

Compatibility with ATTACK boilers

The PR45 component is designed 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 checking the installation manual for the specific boiler model for the exact connection port type and the maximum permitted length of the discharge route, as this may vary slightly depending on the boiler output (20, 28 or 48 kW for the KT series).

Installation and warnings

Ø80 pipes are connected using the same plug-in system as coaxial components, with the seal included in the joint. On horizontal sections of the exhaust branch, a slope of at least 3° toward the boiler is maintained, and longer sections are mechanically supported with clamps (usually every 1–1.5 m) according to the installation manual.

In general, horizontal sections of the discharge route must have a slope of at least 3° toward the boiler or the nearest condensate trap, so that condensate does not accumulate in the pipe. Installation should be performed by a person qualified to install gas appliances and their discharge systems, in accordance with the installation manual for the specific boiler and with the STN EN 15287 standard.

Standards and safety requirements

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

Installation may only be carried out by a person qualified to install and service gas appliances, who will issue an inspection report or commissioning protocol upon completion. In case of any change to the route compared to the originally 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 permitted by the manufacturer – otherwise there is a risk not only of boiler malfunction but also loss of warranty and, in extreme cases, a safety risk of flue gas leakage.

Maintenance and service inspection

Straight Ø80 sections do not wear out when properly installed (slope, mechanical fastening with clamps). For longer horizontal sections, it is recommended to check the sagging and condition of the clamp fixings during a service inspection.

The recommended inspection interval for the entire discharge route is once a year, usually as part of a regular boiler service inspection carried out by an authorised service technician. On this occasion, this specific component is also checked, along with the patency of the condensate path and the overall condition of the joints along the entire route from the boiler to the outlet outside the building.

Typical usage scenarios

Scenario 1 – extending both branches of the separated system through the attic: after the distributor, both the exhaust and intake branches continue vertically to the roof, with the required number of metres of Ø80 pipe used equally on both sides.

Scenario 2 – routing the intake branch through a side wall with exhaust through the roof: the exhaust branch rises to the roof, while the intake branch is routed separately through a short horizontal section of Ø80 pipe through the side wall of the utility room.

Related components in the ATTACK KT range

This universal Ø80 pipe complements the offer of the separated system, along with the chimney kit PR50 (final roof component) and the distributors PR51/PR51A/PR51B (transition from the coaxial system). By combining the required number of metres of PR45 on both branches (exhaust and intake), the exact route length from the distributor to the roof kit is assembled.

A complete overview of all components of the ATTACK KT / KT PLUS flue gas discharge system (elbows, extensions, chimney terminals, condensate traps and distributors for diameters 60/100 mm and 80 mm) can be found in the category Condensing boilers > flue gas discharge, flue pipes > accessories by brand > Attack on this e-shop.

Summary

ATTACK KT exhaust and intake pipe 1 m, diameter 80, PP (code PR45) is a component of the type exhaust or intake pipe 1000 mm with a diameter of 80 mm, made of polypropylene (PP) material, belonging to the separated system (Ø80/Ø80). Recommended installation orientation: vertical and horizontal. The component is designed for boilers ATTACK ACKT20, ACKT28 and ACKT48 (Condensing KT series), ATTACK KST24 (Condensing KST) and ATTACK KZT25 (Condensing KZT) and is part of the wider range of ATTACK KT discharge components available on this e-shop, allowing a complete flue gas discharge route to be assembled exactly according to the layout of a specific installation.

Frequently asked questions

Can the Ø80 pipe (PR45) be used simultaneously on both the exhaust and intake branches in the same installation?
Yes, the component is universal – the same type of pipe is used on both branches of the separated Ø80/Ø80 system, since they have the same diameter and material requirements. When ordering, it is therefore sufficient to calculate the total number of metres required for both branches combined.

Do PR45 pipes on the exhaust branch need additional insulation?
When routed through a heated space, insulation is usually not necessary, but for longer sections in unheated spaces or where there is a risk of moisture condensation on the pipe surface, insulation is recommended, similar to the coaxial system.

Do I need a functional chimney for an ATTACK condensing boiler?
No. ATTACK Condensing KT, KST and KZT condensing boilers have a closed combustion chamber with forced draught – they draw combustion air from outside and discharge flue gases through their own discharge system (coaxial 60/100 mm or separated Ø80/Ø80). A masonry chimney is therefore not needed; a wall or roof penetration for the plastic-aluminium pipe is sufficient.

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

Why does water actually drip from the flue gas discharge?
A condensing boiler cools the flue gases enough that the water vapour contained in them condenses – it is precisely from this additional heat that the boiler gains its high efficiency. The resulting condensate is slightly acidic and must be drained through the condensate trap into the boiler's siphon; that's why all horizontal pipe sections have a prescribed slope toward the boiler or the trap.

Can the coaxial 60/100 mm pipe be combined with the separated Ø80/Ø80 system?
Yes, that's exactly what a distributor is for (e.g. PR51, PR51A or PR51B), which splits a single coaxial pipe from the boiler into two separate Ø80 mm pipes. It is used for longer routes or when the intake and exhaust need to be routed in different directions.

Can I combine components of different diameters or from another manufacturer with the ATTACK discharge system?
It is recommended to use a certified system from the same manufacturer specified in the manual for the specific boiler (for ATTACK Condensing boilers, this is the ATTACK KT/KT PLUS system). Combining components of different diameters, materials, or from other manufacturers may result in leaks, incorrect condensate drainage, and loss of the boiler warranty.

How often should the discharge pipe and condensate trap be checked?
A visual check of joint tightness and condensate trap patency is recommended at least once a year, ideally during a regular boiler service inspection. For facade or roof outlets, it is also necessary to check that the terminal grille is not clogged with leaves, insects, or snow.

Does the flue gas discharge need to be insulated?
When the discharge is routed through a heated space, insulation is usually not necessary, since the surface temperature of the coaxial pipe is low. For longer sections routed through unheated spaces (attic, facade) or where there is a risk of moisture condensation on the pipe surface, additional insulation is recommended, especially at the condensate trap, to prevent freezing.

What happens if the flue gas discharge is undersized or too long?
If the maximum equivalent discharge length is exceeded or in case of leaks, the boiler generally reports a fault related to flue gas/air flow (fan fault, pressure switch or flue path) and shuts down for safety reasons. The solution is to recalculate the route according to the manual and make adjustments if necessary (shorter route, fewer elbows, or switching to the separated Ø80/Ø80 system).

Can this component be used in a cascade connection of multiple boilers?
For cascades with multiple boilers, the separated Ø80/Ø80 system with a shared collector chimney is usually used, or separate terminals for each boiler according to the cascade's design documentation. The specific components (extensions, elbows, distributors) are also compatible in this configuration, but minimum outlet distances according to STN EN 15287 must be observed.

How do I know exactly which components I need for my installation?
The most reliable way is to base it on the installation manual for the specific boiler model (ACKT20/28/48, KST24, KZT25), which contains diagrams of typical configurations and maximum permitted lengths. For a more complex or unusual 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.

Does condensate from the flue gas discharge need to be neutralised before being discharged into the sewer?
For typical family homes with a small boiler output, neutralisation is generally not required due to the small amount of condensate and its dilution with other wastewater, but applicable legislation and the requirements of the local sewer authority must be followed. For higher outputs or boiler cascades, it is recommended to install a condensate neutralisation device before discharging it into the public sewer.

Is operating a condensing boiler with this type of discharge noisier than with a classic chimney?
Forced draught (from the boiler's fan) may be associated with a slight operational noise, which, however, is minimal with a properly installed and mechanically fastened route (without freely vibrating pipe sections) and is generally comparable to or lower than the noise of a classic atmospheric boiler with chimney discharge.

Can this component be installed by myself, or is a professional required?
The mechanical connection of the components (plug-in system) itself is simple, but connecting the discharge to a condensing boiler, calculating the maximum route length, and commissioning the boiler must be carried out by a person qualified to install gas appliances – this is both a manufacturer's requirement and a legal requirement for maintaining the warranty and safe operation.

Does the number and type of these components affect gas consumption or boiler efficiency?
They do not directly affect consumption, but they do indirectly – the greater the resistance of the discharge route (many elbows, a long route near the limit), the more energy the boiler's fan must expend to overcome this resistance, and the sooner the boiler may limit its output or report a fault. Designing the route with the smallest possible number of components is therefore also advisable from the point of view of operating economy.

Warranty

This ATTACK discharge system component is covered by a 24-month warranty from the date of dispatch from the warehouse, the same as other accessories for ATTACK condensing boilers. In case of a claim, we recommend keeping the proof of purchase and, if necessary, photo documentation of the installation method, since with discharge systems, functionality is closely linked to the correctness of installation (maintaining the slope, maximum route length, and distances according to the manual).