Vaillant recoVAIR EPP ducting 210/180 mm, length 500 mm

Product detailed description

Vaillant recoVAIR EPP ducting 210/180 mm, length 500 mm is a shorter, compact variant of the straight duct section from the same modular system of parts as the one-metre-long recoVAIR ducting - it has an identical flat oval cross-section of 210 x 180 mm made of expanded polypropylene (EPP), differing only in the half-length of the supplied piece. In practice, this shorter piece has its own specific, irreplaceable place in duct installation, particularly where space constraints or the exact length of the run do not allow the one-metre section to be used efficiently without excessive cutting and material waste.

When to reach for the 500 mm variant instead of the metre-long one

When designing and installing the recoVAIR ductwork, the 500 mm section is most often used in the following situations:

• Completing a run to an exact length - if the remaining required length of the run is between 500 and 1000 mm, it is more practical to use the shorter 500 mm piece and trim it slightly, rather than cutting a larger piece from the one-metre ducting and wasting the remaining material.
• Tight spaces - in places with a limited length of straight section between two fittings (for example between two elbows placed close together, or between the unit and the nearest distributor in a small utility room), a longer one-metre section simply will not fit without unnecessary trimming on site.
• Handling in hard-to-reach spaces - a shorter, and therefore lighter, piece of ducting is easier to carry and slide into narrow suspended ceiling or attic spaces with limited manoeuvring room, where handling a longer one-metre section would be awkward or practically impossible.
• Repairs and servicing - when replacing a damaged section of existing ductwork, it is often necessary to replace only a short segment, for which the 500 mm piece is ideal, without having to buy and then cut away and discard most of the material.

Material and technical properties

All the technical properties of this ducting are identical to the longer one-metre variant, since it is the same extruded/moulded EPP profile, just shortened to half the length:

• The material's low thermal conductivity eliminates the need for additional insulation on most indoor sections of the run.
• Low weight makes installation easier even in tight or hard-to-reach spaces, where handling heavier material is complicated.
• The closed cellular structure of the material is moisture-resistant and does not degrade even with occasional condensation on the surface of the ducting.
• The smooth internal surface minimises the frictional resistance to airflow and, with it, the noise level and energy demand of the recoVAIR unit's fan.

Installation procedure

1. Measure the exact required length of the section directly at the installation site, including the length of insertion into adjoining couplings or fittings.
2. If the ducting still needs to be shortened, make a perpendicular cut with a fine-toothed saw and remove any burrs from the cut.
3. Slide the ducting into the coupling, elbow, T-piece or other end element at one end and check that the joint is sufficiently deep and tight.
4. Repeat at the other end of the section and then support the whole segment with a universal mounting bracket if the length of the section exceeds the distance over which the ducting is self-supporting without a bracket.
5. Check that no gaps remain at the joints through which air could leak - seal any leaks according to the manufacturer's recommendations.

Combining with other ductwork components

Just like the one-metre variant, the 500 mm ducting is also fully compatible with the entire Vaillant recoVAIR range of components with a 210/180 mm cross-section - 90° elbows, couplings, T-pieces, the connection adapter to the air distributor or collector, facade grilles and the noise silencer. Experienced ventilation duct designers recommend combining both available length variants (500 mm and 1000 mm) when planning the run so that the resulting number of cuts, and therefore the amount of waste material, is as low as possible, which also shortens the installation time on site.

Why not to waste material and choose the right length in advance

Although it may seem simpler to always order longer one-metre sections and shorten them as needed, in practice this strategy leads to unnecessary material waste and higher transport costs for the excess volume of ducting brought to the site. By properly combining 500 mm and 1000 mm pieces in advance, already at the ductwork design stage, it is possible to significantly reduce the amount of cut-off material, simplify logistics on site (a smaller volume of material to transport and store) and speed up the actual installation, since the installer does not have to carry out as many measurements and cuts on site.

Maintenance and servicing

Like the longer variant of the ducting, this shorter section also does not require active maintenance during operation, as it is located in concealed parts of the house structure. During regular servicing of the ventilation system (most often together with replacing the filters of the recoVAIR unit), it is advisable to check accessible joints and duct segments for mechanical damage or loosened connections, which could cause a drop in performance or an increase in system noise.

Compatibility with other ductwork components in terms of tolerances

The precision of the outer and inner dimensions of the duct ends is crucial for a reliable, airtight connection with the couplings, elbows, T-pieces and other fittings of the recoVAIR system. Even a minimal deviation in dimensional tolerance (for example when using non-original, visually similar ducting from another manufacturer) can cause the joint to be either too loose (risk of air and noise leakage) or, conversely, too tight (risk of damage to the duct edge during installation, or difficult removal during future servicing). Original Vaillant recoVAIR parts are designed and manufactured so that the tolerances of all components within the entire modular system - ducting, couplings, elbows and end elements - fit together precisely without the need for additional sealing beyond the standard installation procedure.

Why an original Vaillant part

By using an original short Vaillant recoVAIR EPP piece instead of a universal replacement from another manufacturer, you guarantee that the dimensional tolerances and wall thickness of the material correspond exactly to the rest of the system, preventing microscopic leaks at the joints, which, added up over the entire duct run, can cause a measurable drop in heat recovery efficiency and increased operating noise.

Practical example of use in a family house project

Let us imagine a typical situation when installing recoVAIR ductwork in the attic space of a family house: the unit is located in a utility room, and the main branch of the ductwork runs to an air distributor approximately 2.3 metres away. Instead of using three one-metre sections (which would mean significant trimming and material waste, since 3 x 1000 mm = 3000 mm when only 2300 mm is needed), it is much more efficient to combine two one-metre sections with one 500 mm piece (2 x 1000 mm + 1 x 500 mm = 2500 mm) and then only make a minimal final trim to the combined assembly to get the exact length. This approach significantly reduces the amount of waste material and also shortens the time needed for cutting on site.

A similar consideration applies when connecting the recoVAIR unit to the facade grille, where the distance between the unit (often located in a utility room by the perimeter wall) and the facade is usually short - this is precisely where the 500 mm piece is most often used as the only straight duct segment needed between the elbow at the unit and the facade grille.

Storage and handling before installation

Although the EPP material is mechanically durable, when storing and transporting the ducting on site, it is recommended to follow a few principles that prevent damage to the material before it is installed in the ductwork:

• Store the ducting on a flat surface, ideally laid down flat, to prevent deformation of the cross-section due to point loading.
• Protect the material from direct sunlight during longer storage on site - even though the installed ducting is protected from UV radiation indoors, prolonged exposure to direct sunlight before installation (for example when stored outdoors) can over time affect the colour stability of the surface.
• When handling several pieces at once, make sure that sharp edges of other building materials (for example metal profiles) do not damage the surface or edges of the EPP ducting.
• Before installation, check that the ends of the ducting have not been damaged during transport, as they must fit precisely into the couplings and fittings - a damaged end edge can cause a leaky joint.

The difference between straight ducting and fittings in project documentation

When reading the project documentation for a ventilation ductwork system, it is important to distinguish between straight sections of ducting (such as this 500 mm piece) and fittings that change the direction or split the airflow (elbows, T-pieces, couplings). The designer usually states the total length of straight sections required on a given branch of the ductwork, and separately the number and type of fittings needed. When converting this total required length into specific pieces of ducting to order (a combination of 500 mm and 1000 mm pieces), it is advisable to choose a ratio that minimises the number of cuts and the amount of leftover waste material - in practice, this is most often solved by first using whole one-metre sections for longer straight runs, with the remaining (shorter) length completed using a 500 mm piece, if necessary shortened further.

Compatibility with both decentralised and centralised solutions

Although the 210/180 mm cross-section is most often associated with centralised recoVAIR VAR units with branched air distribution to individual rooms via a distributor and collector, the shorter 500 mm duct piece also finds use in shorter connecting sections within decentralised or partially centralised solutions, for example when connecting the unit to the nearest facade grille, or for a short connection between two technical components in the immediate vicinity of the unit, where a longer one-metre section is simply not needed or spatially suitable.

The impact of a properly designed duct run on overall satisfaction with ventilation

The quality and precision of the air ductwork installation has a direct impact on how the occupants of the house will perceive the operation of the entire mechanical ventilation system. Leaks caused by incorrect cutting or an unsuitable combination of duct lengths manifest themselves as:

• increased noise from the recoVAIR unit's fan, which has to compensate for the air leakage with a higher output,
• uneven ventilation of individual rooms, when part of the supplied or extracted air escapes outside the planned route,
• increased electricity consumption needed to drive the fan,
• and, in extreme cases, also a reduction in the real efficiency of heat recovery compared with the value declared by the manufacturer for the given unit.

This is precisely why what at first glance seems like a "minor" detail - choosing the correct length of duct piece for a specific section of the run - ultimately translates into overall user satisfaction with the system, its noise level and the real operating costs of electricity.

Recommendations for ordering the right quantity

When planning the purchase of ducting for an entire project, we recommend basing the calculation on the ventilation project documentation, which should include the total length of straight sections on the individual branches of the ductwork. This total length should be split into a combination of 1000 mm and 500 mm pieces so that the number of cuts required and the amount of waste material are minimal, with a slight reserve (typically 5-10% extra) in case of a cutting error or an additional adjustment to the run during installation.

Summary

The Vaillant recoVAIR 210/180 mm EPP ducting, 500 mm long, is a practical complement to the one-metre ducting, allowing precise, material-efficient and spatially flexible completion of the air distribution run for recoVAIR VAR ventilation units. Thanks to the same technical properties as the longer variant (low weight, thermal insulation, rigidity, ease of processing), it is a full-fledged part of the modular system of original accessories needed for reliable, quiet and energy-efficient operation of the entire mechanical ventilation system with heat recovery. We recommend having a sufficient number of pieces available already when ordering material for the whole project, so that the installer does not have to interrupt the installation to order an additional missing short duct segment.