ATTACK KT horizontal end pipe, diameter 60/100, painted

Product detailed description

ATTACK KT horizontal terminal pipe, diameter 60/100, painted finish is part of the original ATTACK KT / KT PLUS flue gas exhaust and combustion air intake system, designed for ATTACK Condensing wall-mounted condensing gas boilers. This component belongs to the category: terminal pipe – facade (horizontal) outlet, diameter 60/100 mm, made of galvanized steel with painted surface finish.

Sealed combustion chamber and flue gas exhaust in ATTACK condensing boilers

ATTACK condensing gas boilers operate with a sealed (turbo) combustion chamber – unlike older atmospheric boilers, they do not need air from the room in which they are installed, nor a functional brick chimney. They draw combustion air directly from outside the building and discharge flue gases outward, also using forced draught provided by a fan built into the boiler. This closed circuit is implemented in practice in two ways: coaxial (concentric) piping, where a smaller pipe for air intake runs inside a larger pipe with the annular space used for flue gas discharge, or a separate system with two independent pipes. The coaxial version with a diameter of 60/100 mm is the most common solution for boilers up to approx. 35 kW, as it allows both the exhaust and intake to be routed through a single wall or roof penetration, is quick to install, and has a discreet appearance.

Every element of the exhaust assembly – elbow, extension, condensate trap, chimney terminal and distributor – must be airtight, resistant to flue gas temperatures and to condensate, which is produced in large quantities during operation of a condensing boiler precisely because the boiler is able to utilize the latent heat of water vapor in the flue gases. This condensate is precisely why the ATTACK KT system cannot be safely replaced with a standard chimney component intended for atmospheric boilers – such components are not designed for permanent contact with acidic condensate or for the correct slope that drains condensate back into the boiler or into the trap.

Terminal pipe – facade outlet

The horizontal terminal pipe is used when both the flue gas exhaust and air intake are routed directly through the building's exterior wall (facade) without the need to route piping to the roof. This is a common solution for boiler rooms and utility rooms on the ground floor or in family houses where the boiler is located near an exterior wall. The component includes a protective grille to prevent the ingress of dirt and is designed so that the direction of flue gas flow on the facade does not point toward a window, ventilation opening, or a pavement close to ground level.

For facade outlets, it is necessary to maintain minimum clearance distances from windows, doors and ventilation openings (both own and neighboring) according to STN EN 15287 and the installation manual for the specific boiler – usually at least 0.3–0.6 m from a window and a greater distance from ventilation ducts.

Example of a typical connection in a real installation:
boiler → 0.5 m extension → 90° elbow → horizontal terminal pipe (facade outlet).

Step-by-step installation procedure

1. Choose the location of the facade penetration considering the minimum clearances from windows, doors and ventilation openings according to STN EN 15287.
2. Drill the penetration with a slight slope outward so that any condensed moisture does not leak into the building.
3. Fit the terminal pipe and seal the area around the penetration against rainwater ingress into the facade structure.
4. Check that the protective grille is freely permeable and does not face directly toward a window or ventilation opening.
5. After finishing facade work around the penetration, carry out a tightness check.

Material and construction

This component is made of galvanized steel with an additional painted surface finish, which increases resistance to weather influences on the exterior part of the route (e.g. the chimney terminal on the roof) and also gives the component an aesthetic, uniform appearance matching the design of ATTACK Condensing boilers. The surface finish withstands normal flue gas temperatures from a condensing boiler and brief contact with condensate when the pipe has the correct slope, which ensures that condensate does not stand in the component for long periods.

System classification: coaxial (concentric). Design: horizontal, facade penetration.

Compatibility with ATTACK boilers

The PR44 component is designed for the connection system common to the entire range of ATTACK wall-mounted condensing boilers 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 socket and the maximum allowed length of the exhaust route, as this may vary slightly depending on boiler output (20, 28 or 48 kW for the KT series).

Installation and warnings

The terminal pipe is installed perpendicular to the facade so that the grille faces outward and is not covered by anything (bushes, landscaping, snow accumulation). Minimum clearances from windows, doors, ventilation openings and ground level (generally at least 0.3 m above ground level for pavements, more for parking areas) must be maintained according to STN EN 15287 and the boiler manual.

As a general rule, horizontal sections of the exhaust 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 carried out by a person qualified to install gas appliances and their exhaust systems, in accordance with the installation manual for the specific boiler and with the STN EN 15287 standard.

Standards and safety requirements

Installation of flue gas exhaust 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 clearances of the outlet from windows, ventilation openings, neighboring properties and ground level, as well as the minimum height of the outlet above the roof plane. The boiler itself and its exhaust system must also meet the requirements of STN EN 483 (type C gas boilers) and be installed in accordance with TPP (technical operating regulations) applicable to gas appliances.

Installation may only be carried out by a person qualified to install and service gas appliances, who upon completion issues an inspection report or commissioning protocol. In case of any change to the route compared to the originally approved design (e.g. additional route extension, change in the number of elbows), it is necessary to check whether the boiler still falls within the parameters permitted by the manufacturer – otherwise there is a risk not only of boiler malfunction but also of loss of warranty and, in extreme cases, a safety risk of flue gas leakage.

Maintenance and service inspection

It is advisable to occasionally check the terminal's protective grille to ensure it is not blocked by leaves, insects or cobwebs, which could restrict the flow of air and flue gases – especially if the component is located near trees or bushes.

The recommended inspection interval for the entire exhaust route is once a year, usually as part of the regular boiler service inspection carried out by an authorized service technician. On this occasion, this specific component, 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 are also checked.

Typical usage scenarios

Scenario 1 – ground-floor boiler room in a family house: the boiler is located near the exterior wall of the utility room, and the exhaust is routed by the shortest possible path directly through the facade without the need to route piping to the roof.

Scenario 2 – industrial or commercial building with low ceiling height: limited space above the boiler does not allow for vertical routing to the roof, so a facade outlet is chosen as the only practical solution.

Related components in the ATTACK KT range

This terminal pipe is the facade (horizontal) counterpart to the roof chimney terminal PR39 – both components serve the same function (safe outlet of the exhaust outside the building), differing only in the type of penetration (facade vs. roof) and the design of protection against water and dirt ingress.

A complete overview of all components of the ATTACK KT / KT PLUS flue gas exhaust 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 exhausts, flue pipes > accessories by brand > Attack on this e-shop.

Summary

ATTACK KT horizontal terminal pipe, diameter 60/100, painted finish (code PR44) is a component of the terminal pipe – facade (horizontal) outlet type with a diameter of 60/100 mm, made of galvanized steel with painted surface finish, belonging to the coaxial (concentric) system. Recommended installation orientation: horizontal, facade penetration. The component is designed for ATTACK ACKT20, ACKT28 and ACKT48 (Condensing KT series), ATTACK KST24 (Condensing KST) and ATTACK KZT25 (Condensing KZT) boilers, and is part of the wider range of ATTACK KT exhaust components available on this e-shop, allowing a complete exhaust route to be assembled exactly according to the layout of a specific installation.

Frequently asked questions

What clearance from a window does a facade outlet with the PR44 component require?
The exact value is specified in the manual for the specific boiler and in the STN EN 15287 standard, usually a minimum of 0.3–0.6 m from the edge of the nearest openable window or ventilation opening. If in doubt about a specific layout, we recommend consulting an installation company before drilling the penetration.

Can the PR44 terminal pipe be placed low above a pavement or terrace?
The STN EN 15287 standard also sets a minimum height of the outlet above walkable surfaces (pavement, terrace, parking space) due to the risk of disturbing passers-by with warm flue gases and condensate – the specific value should be verified in the boiler manual and respected when designing the layout.

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

What is the maximum flue gas exhaust length for 60/100 mm coaxial piping?
The exact value depends on the specific boiler model (ACKT20, ACKT28, ACKT48, KST24 or KZT25) and is specified in the installation manual – usually 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 can cause a boiler fault message.

Why does water actually drip from the flue gas exhaust?
A condensing boiler cools the flue gases enough that the water vapor contained in them condenses – it is precisely from this 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; this is why all horizontal pipe sections have a prescribed slope toward the boiler or the trap.

Can 60/100 mm coaxial piping be combined with a separate Ø80/Ø80 system?
Yes, this is precisely the purpose of a distributor (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 a different manufacturer with the ATTACK exhaust system?
It is recommended to use a certified system from the same manufacturer as 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 can result in leaks, incorrect condensate drainage and loss of the boiler warranty.

How often should the exhaust piping and condensate trap be checked?
A visual inspection of joint tightness and the patency of the condensate trap is recommended at least once a year, ideally during the boiler's regular service inspection. For facade or roof outlets, it is also necessary to check whether the terminal grille is blocked by leaves, insects or snow.

Is it necessary to insulate the flue gas exhaust?
When the exhaust is routed through heated space, insulation is usually not necessary, as the surface temperature of the coaxial piping is low. For longer sections routed through unheated space (attic, facade) or where there is a risk of moisture 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?
If the maximum equivalent exhaust length is exceeded or there are leaks, the boiler will usually report a fault related to flue gas/air flow (fan fault, pressure switch fault or flue path fault) and shut down for safety reasons. The solution is to recalculate the route according to the manual and make adjustments if needed (shorter route, fewer elbows, or switching to a separate Ø80/Ø80 system).

Can this component be used in a cascade connection of multiple boilers?
Cascades with multiple boilers usually use a separate Ø80/Ø80 system with a common collecting flue, or separate terminals for each boiler according to the cascade's project documentation. The specific components (extensions, elbows, distributors) are also compatible in this connection, but minimum outlet clearances according to STN EN 15287 must be maintained.

How do I find out exactly which components I need for my installation?
The most reliable approach is to use the installation manual for the specific boiler model (ACKT20/28/48, KST24, KZT25), which contains diagrams of typical connections and maximum permitted lengths. For a more complex or unusual layout (long route, penetration through multiple floors, cascade), we recommend consulting an installation company or the seller directly before ordering the exact number of pieces.

Does condensate from the flue gas exhaust need to be neutralized before discharge into the sewer?
For typical 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 applicable legislation and the requirements of the local sewer operator must be followed. For higher outputs or boiler cascades, it is recommended to install a condensate neutralization device before discharge into the public sewer.

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

Can installation of this component be done by yourself, or is a professional required?
The mechanical joining of components (plug-in system) itself is simple, but connecting the exhaust to the 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 requirement and a legal requirement to maintain the warranty and ensure safe operation.

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

Warranty

This ATTACK exhaust 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 the event of a claim, we recommend keeping the proof of purchase and, if necessary, photo documentation of the installation method, as with exhaust systems the functionality is closely linked to the correctness of the installation (compliance with slope, maximum route length and clearances according to the manual).