Vaillant recoVAIR fixing straps for 75/62 mm hose (100 pcs)

Product detailed description

Fixing straps (Vaillant recoVAIR, code 0020231957)

Practical consumable material for installation and servicing of recoVAIR ductwork – an indispensable addition to every connection of the 75/62 mm flexible hose.

Original cable ties for securing and fixing the 75/62 mm flexible air hose on the spigots of adapters, elbows, couplings and manifolds in the recoVAIR system – pack of 100 pieces.

Fixing straps are a simple, yet absolutely essential connecting material used when installing almost every single joint in the entire ducting of the Vaillant recoVAIR controlled ventilation system with heat recovery. While the sealing ring on the spigot of the adapter, elbow, coupling or end piece ensures the airtightness of the joint, it is the fixing strap around the hose that ensures the mechanical stability of this connection over time – meaning that the hose does not slide off the spigot even after years of operation, due to fan vibration, thermal expansion of the material, or occasional mechanical contact during inspection visits to the attic or installation shaft.

Overview of main parameters

Type: plastic cable tie with a ratchet locking mechanism; length: approximately 432 mm; width: 4.8 mm; number of pieces per pack: 100; material: durable plastic (polyamide/nylon) with good tensile strength; colour: typically natural/black depending on the manufacturer's current design; purpose: securing the 75/62 mm flexible hose to the spigots of recoVAIR system fittings, or fixing the hose to the supporting structure on longer straight sections of the run.

Technical parameters

The pack contains 100 plastic cable ties with a length of approximately 432 mm and a width of 4.8 mm, a size sufficient to safely wrap around a hose with an outer diameter of 75 mm (or slightly larger diameters of other system components, if needed) with enough reserve for firm tightening using the ratchet mechanism typical of this type of fastening material. The material is durable plastic (usually nylon or a similar polymer), which withstands, without loss of strength, the typical temperature range found in hidden installation spaces of a house – from cold winter temperatures in an unheated attic to elevated summer temperatures under the roof covering.

Additional fastening material for seals

In practice, fixing straps are almost always ordered together with replacement seals (code 0020180826), as together they form the complete pair needed to properly make any connection in the system – the seal ensures airtightness, the strap ensures the mechanical stability of the joint over time. When planning materials for a larger installation, we recommend always allowing for both items in an appropriate ratio, so that the installation or service company does not run short of either material during the work.

Where fixing straps are used in the system

• On the spigots of adapters connecting the hose to a manifold or collector (straight and 90° versions),
• On both ends of elbows, which change the direction of the hose run,
• On both ends of straight couplings, extending or repairing the hose run,
• On the inlet spigots of end pieces when connecting to outlets with a DN 125 mm connection,
• For occasional fixing of the hose itself to the supporting structure of the ceiling or roof frame on longer straight sections of the run, where it is advisable to prevent sagging or unwanted movement of the hose.

In practice, this means that one to two pieces of fixing strap are needed for every single joint in the entire ducting (and there can be several dozen such joints in a typical family house), which explains why this material is supplied in larger packs of 100 pieces – for installations with dozens of metres of ducting and many fittings, the actual consumption of straps is quite high.

Why quality fixing matters

An incorrectly or insufficiently tightened fixing strap can, over years of operation, lead to the hose gradually slipping off the spigot of the adjacent component, causing a progressive increase in leakage at the joint and the associated loss of air outside the designed route. This type of fault is insidious precisely because it does not occur suddenly, but gradually over months or years, so the homeowner often does not notice it until it manifests as a more visible symptom – for example, noticeably lower airflow at an outlet, higher humidity in the room in question, or during an inspection of the system by a service technician. Using quality original straps with sufficient strength and resistance to temperature changes therefore directly contributes to the long-term reliability and energy efficiency of the entire system.

Correct fixing procedure

During installation, it is important to first push the hose onto the spigot of the relevant component (adapter, elbow, coupling) up to the locking ridge, which is shaped on most spigots in this system precisely to define the correct insertion depth. Only afterwards should the fixing strap be wrapped around the hose at the spigot (not in front of the locking ridge, but exactly at its level or just behind it) and tightened firmly until the hose is completely fixed on the spigot with no possibility of rotating or sliding off. Tightening that is too loose will not provide sufficient fixing, while tightening that is too forceful may locally deform the corrugated wall of the hose and cause a local narrowing of the cross-section – we therefore recommend tightening the strap moderately firmly, without excessive force, and visually checking that the profile of the hose at the point of tightening is not visibly deformed.

Alternatives and why to avoid them

Some less experienced installers use improvised solutions instead of original fixing straps, such as wires, insulating tape, or universal cable ties from another area of construction. These alternatives generally have worse mechanical properties for this purpose – a wire may over time cut into or damage the wall of the hose, insulating tape loses adhesion during temperature fluctuations, and universal cable ties may not have sufficient width or strength to reliably secure a joint of the required diameter over the long term. Original Vaillant fixing straps, on the other hand, are dimensionally and mechanically designed exactly for this purpose and, in combination with the other system components, guarantee reliable and long-term stable fixing of all joints.

Storage and disposal of leftover material

After tightening the cable tie, there is usually a protruding end, which is recommended to be cut off as close as possible to the strap's locking mechanism (so that it does not protrude into the surrounding space and does not pose a risk of injury during later handling in the installation area). Unused straps should be stored in a dry environment out of direct sunlight, as long-term exposure to UV radiation can gradually reduce the flexibility and strength of the plastic material even before use.

Frequently Asked Questions (FAQ)

Relation to overall building airtightness (Blower Door test)

In modern low-energy and passive houses, certification of the overall airtightness of the building envelope using the so-called Blower Door test is increasingly required. Although this test primarily focuses on leaks in the building structure itself (windows, doors, service penetrations through the building envelope), it is indirectly related to the quality of the internal ventilation ducting as well – if the ventilation ducting leaks air into or out of structural cavities instead of into the living space, this can distort the results of the overall building airtightness measurement. Properly fixed joints with original straps and seals therefore contribute not only to the correct functioning of the ventilation system itself, but also indirectly to better results in the overall energy assessment of the building.

Service technicians' experience with long-term operation

Service organisations carrying out regular inspections of controlled ventilation systems with heat recovery repeatedly confirm that, after several years of operation, the quality and correct tightening of fixing straps at the joints is one of the most frequently checked and sometimes corrected details during inspection. The properties of cheap, non-original straps become apparent precisely after a longer period of operation, when a joint that was originally firm may gradually lose strength due to repeated temperature cycles over the seasons. Using original material already at the initial installation is therefore an investment that pays off in the long term, by reducing the need for additional service interventions.

Compatibility with other system components

These fixing straps can be used universally on all spigots and joints within the 75/62 mm accessory range of the Vaillant recoVAIR system – that is, on adapters (straight and 90°), elbows, straight couplings, and end pieces with a DN 125 mm connection. Due to their versatility and low unit price within a larger pack, they are a natural part of almost every accessory order for this system, together with replacement seals, which form the other half of the basic connecting set needed for installation or servicing.

Who this product is for

Fixing straps are a basic consumable material for every installation company carrying out ducting for Vaillant recoVAIR controlled ventilation with heat recovery, as well as for service organisations performing repairs or modifications to existing ducting. Given the large number of joints in a typical installation, we recommend always having a sufficient supply of this material available directly on site, so that the installation is not delayed due to a shortage of this seemingly trivial, yet in practice essential, fastening material.

Practical tips for efficient work on site

When installing larger sections of ducting, we recommend always keeping a pack of straps close at hand right at the work location (for example, hung on a tool belt or in a portable installation bag), as frequently interrupting work to fetch more material unnecessarily prolongs installation time. Experienced installers also prepare straps in advance to the required length or thread them onto the hose before its final placement in the structure, saving time especially when installing in cramped attic spaces or a narrow gap above a suspended ceiling, where movement and tool handling are limited.

Environmental aspect and disposal of offcuts

The cut-off ends of straps after tightening, as well as any unused or damaged pieces, are common plastic waste from construction work. We recommend collecting them in a separate bag directly during installation, so that they do not remain scattered in the installation spaces of the house, where they could, for example, clog gutters or other technical equipment if they ended up outside the direct installation area. Responsible handling of small construction waste is part of the professional execution of the entire installation.

Summary and pack contents

The pack contains 100 fixing (cable) straps with a length of approximately 432 mm and a width of 4.8 mm, designed for mechanically securing the 75/62 mm flexible air hose to the spigots of adapters, elbows, couplings and end pieces in the Vaillant recoVAIR system. This is original fastening material directly from the manufacturer Vaillant, essential for the long-term reliable and airtight installation of the entire ducting of the controlled ventilation system with heat recovery. Given the high consumption of this material in larger installations, we recommend always ordering at least one full pack per project, even if a preliminary estimate suggests a smaller quantity would suffice – the price of one pack is negligible compared to the cost of any additional reordering and delay in on-site installation, and any leftover material will always come in handy for future service interventions or minor adjustments to the ducting on the same or another installation.