Under the premise of renovating the future Schleiz City Library in an energy-efficient manner, the task was to combine the often conflicting requirements for climate protection and monument protection. The preliminary plan to install a central ventilation system in the front building therefore turned out to be unfeasible. The installation of flexible, decentralized ventilation systems required significantly fewer structural measures. Most of them disappear into the walls, making it relatively easy to comply with the preservation order. The former Reussische Amtshaus, located in the small town of Schleiz in Thuringia, was bought by the city of Schleiz in 2008. The monument will be used as the seat for the new city library “Dr. Konrad Duden ”. The official opening of the new Schleiz City Library took place on May 5, 2011. For the exemplary technical and structural measures in favor of climate protection, the building project was honored not least as part of the “Municipal Climate Protection 2013” competition in the “Climate Protection in Municipal Properties” category. Further inVENTer references.
inVENTer at your side
Architect - TGA specialist planner - energy consultant
We support you in planning your building projects, developing ventilation systems and in briefing your customers. The inVENTer planning department and more than 50 sales representatives worldwide are there for you. Receive high-quality products, specific tender texts and a corresponding ventilation concept including layout and planning proposal from us.
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Your benefits at a glance
Free ventilation concept including planning proposal + energetic evaluation
We work out a ventilation concept for you for individual ventilation planning. Ventilation planning can also be done by hand using a planning tool, but basic specialist knowledge should be available.Contact us. We will be happy to send you the free calculation tool.
Tip: Our ventilation concept provides you with real data with specific ventilation results that you can use for the EnEV certificate. We calculate the individual ventilation values for each of your construction projects.
Concrete tender texts
We provide you with detailed, clearly formulated and product-neutral tender texts.
Tip: Here you will find all the information and tender texts you need.
Complete on-site service
Flexibility in new construction and renovation
Decentralized ventilation systems from inVENTer do not require any additional pipe systems. This saves you time-consuming coordination during the planning phase. The decentralized ventilation systems can be installed in the wall without any problems – both in new buildings and in renovations.
Tip: Request our free planning folder and product information and get an overview.
Effective moisture removal with heat recovery
Due to the permanent exchange of air, the humid, stale air is removed and fresh air is supplied. The ceramic heat accumulator ensures that a large part of the room heat is retained.
Tip: We will give you positioning suggestions for the ventilation systems for your building project. After checking the feasibility of your wishes, we will work together to find a solution for you (including alternative suggestions).
Value retention through effective mold prevention
The constant air change prevents mold and removes pollutants. Costly mold control measures can be avoided.
Tip: We value your work and are happy to include your building project in our advertising materials. Show others what you have created.
Our services for you
High quality “Made in Germany”
The inVENTer ventilation systems, which are manufactured exclusively in Germany, are based on almost 2 decades of experience. The devices are regularly tested in the factory and continuously subjected to quality checks. The low complaint rate of 0.23% (2016) is evidence of high product quality. That is why we grant a 5-year guarantee on all electronic components – for a lifetime on the ceramic memory.
Tip: Our devices have been in use since 1999, so you too can benefit from our experience.
DIBt approvals – TÜV-tested
The German Institute for Structural Engineering (DIBt) specifies the guidelines according to which measurements are to be carried out. If all criteria are met, approval is granted, which ensures that the measured product can demonstrably be used in its area of application. A large number of our products are approved by the DIBt and tested by the TÜV.
Tip: Secure yourself legally with correct ventilation planning.
Lifetime warranty and guarantee
The high quality products from inVENTer have a high performance and durability. You receive a 5-year manufacturer’s guarantee on all electrical parts and a lifelong guarantee on the heat accumulator. InVENTer’s competent customer service will advise you on all technical questions.
Tip: We would be happy to provide you with sample models or demonstration devices for your customers. A visit to one of our showrooms is also possible. We will inform you about a showroom near you.
Planning support & assembly aids
We would be happy to support you with a ventilation concept or specific planning proposals for your construction project. The simple installation of our decentralized ventilation systems takes little time for your installers. Installation training courses and installation films on our website clarify all open questions.
Tip: Download the DXF / DWG drawings (3D) for each product directly into your planning programs and get an idea for yourself. You can find all files for this on the product pages of our homepage.
System provider – solutions for every construction project
The inVENTer portfolio includes numerous different product variations of decentralized ventilation systems, more than any other provider in Germany. Solutions from the basement to the roof, for narrow walls or unusual facades. With the inVENTer PAX, we even offer you the option of ventilating several rooms with a particularly soundproofed and therefore low-noise device. The Simplex wall mounting block is integrated directly into the masonry. This saves valuable time due to the omitted core hole drilling.
Tip: Aesthetics and optics – a wide variety of interior panels and weather protection hoods allow enough variability for your building project. Corner solutions for “hiding” the air outlet in the window reveal are also possible.
Energy efficient in every way
The decentralized ventilation systems from inVENTer have a very low energy consumption. One device has a power consumption of 1 – 3 watts. In addition, up to 94% of the heat from the extracted room air is stored and returned to the living space (heat recovery).
Tip: Use our on-site ventilation experts as a link to your customers and installers. We advise everyone involved during construction planning.
How does decentralised mechanical ventilation work?
How decentralized ventilation systems work
The principle of decentralized ventilation systems is simple, but extremely efficient. Decentralized ventilation systems from inVENTer are always used in pairs. One fan draws in the fresh outside air, the other removes the stale air from the room. The heat of the discharged air is stored in the ceramic core. After the fan changes direction, which takes place every 70 seconds, the stored heat is released to the incoming fresh air. In this way, up to 94% of the room heat is used and is not lost to the outside.
Installation & assembly of decentralized ventilation devices
Checking the individual parts in the complete set. There is no need to procure additional materials.
Use of the wall sleeve: When installing in an existing building, a core drill must be made. In the event of subsequent renovation of the facade, the wall sleeve can be extended with a sliding sleeve.
- Screw the weather protection hood to the facade and slide the hood on from above. The weather protection hood can be adapted to the facade in different colors.
Installation of the thermal accumulator: The thermal accumulator is pushed into the wall sleeve. The fan points to the interior and should be connected to the controller by a specialist. We would be happy to support you if necessary.
- Attaching the inner cover: (insert sound absorbing mat) The frame of the inner cover is attached, the dust filter is attached and the cover is placed on the frame. Various interior cover designs are available for the right look.
You can find comprehensive assembly instructions here.
Alternatively, it is possible to install the “Simplex” wall mounting block. The system is integrated directly into the shell, eliminating the need for core drilling and inserting the wall sleeve. This saves valuable time.
Special inVENTer reference at a glance
Flexible ventilation system for historical buildings – inVENTer
The top four:
1. inVENTer iV14-Zero – soundproof ventilation
- DIBt approval: Z-51.3-429
- air flow: 8,5 – 29 m³/h
- heat recovery: bis zu 87 %
- noise emission: 13 – 29 dB(A)
- To the inVENTer iV14-Zero
2. inVENTer Twin + – single room ventilation
- air flow: 5 – 23 m³/h
- heat recovery: bis zu 94 %
- noise emission: 20 – 44 dB(A)
- To the inVENTer iV-Twin +
3. inVENTer Aviant – App Abluftsteuerung
- extract airflow without cover: 115 m³/h
- noise emission: 17 – 20 dB(A)
- operating voltage: AC 230 V, 59 Hz
- To the inVENTer Aviant
4. iV14-Zero Corner – elegant reveal variant
- air flow: 8,5 – 29 m³/h
- heat recovery: 87%
- noise emission: 13 – 29 dB(A)
- To the inVENTer corner variants
Architects knowledge for decentralised mechanical ventilation
The system decides – central vs. decentralized
In order to dispel the prejudice that decentralized ventilation systems are not “real” ventilation systems, you will find numerous facts in the following that speak in favor of a decentralized ventilation system.In practice, there is currently a choice between central and decentralized ventilation systems. Decentralized systems in particular convince in comparison with a large number of positive properties that help experts convince consumers of this variant. Decentralized ventilation systems are usually cheaper to purchase, install, operate and maintain. The laying of complex pipe systems is not necessary, the installation can be carried out quickly and easily.Thanks to efficient reversible fans, the electrical power consumption in particular is only a few watts and electricity-guzzling heating registers are no longer necessary due to the design and functionality. An integrated ceramic heat storage system saves valuable heating energy as the filtered air released into the room is heated. The versatility of the devices is just as essential. These can also be built into existing properties at a later date and do not entail any complex construction work or long renovation times. For owners, maintaining the value of the property is of particular interest: Proper ventilation with a decentralized system prevents mold. This saves you an expensive renovation or renovation due to mold. This is an advantage for everyone involved – whether straightforward planning for the architect, simple installation for the installer or healthy living comfort for the resident.
Tip: You describe your construction situation to us and we will find the right ventilation solution for it. With numerous different product variants, almost all building projects can be served.
Energy Saving Ordinance 2016 – Even more efficient building and renovation
The Energy Saving Ordinance (EnEV) was set on July 24, 2007 and was last amended on October 24, 2015. The aim of the EnEV is to save energy in buildings. The attainment of the federal government’s energy policy goals should be supported by the pre-ordinance – above all a climate-neutral building stock by 2050.According to Section 6 (2) EnEV, the minimum air exchange required for health in residential buildings is legally prescribed.This becomes important for decentralized ventilation systems in connection with the guideline DIN 1946-6. DIN 1946-6 “Ventilation of apartments – general requirements, requirements for dimensioning, execution and labeling, handover / acceptance (acceptance) and maintenance” requires compliance with the minimum air exchange required for health and heating purposes.The guideline also stipulates that a detailed ventilation concept must be available for new buildings and the renovation of residential buildings. If this concept is not available, the planner is liable for subsequent moisture or mold damage. If it is created and implemented correctly, the results will pay off immediately and sustainably: Reliable and automatic fresh air for the users, preservation of the value of the building without the risk of mold, legal security for planners, stable orders for the providers of ventilation technology. In this case, compliance with the legal requirements is straightforward.
Tip: inVENTer will create the ventilation concept you need, including an energetic assessment. The data can be used for the EnEV certificates.
Mold prevention & value retention
In order to prevent mold in a targeted manner, it is imperative to either ventilate regularly or use a ventilation system. A minimum air change required for health and heating purposes is even required by law in accordance with Section 6, Paragraph 2 of the EnEV (Energy Saving Ordinance). In connection with DIN 1946-6, this means that a ventilation concept must be available in order to meet the legal requirements. In addition, in order to save energy, the EnEV stipulates that buildings should be constructed as impermeable to air as possible. The result is an increased need for ventilation, which is almost impossible to implement with manual window ventilation. The risk of mold increases significantly if there is insufficient ventilation. The humidity in the rooms rises to saturation. When this is reached and the air can no longer absorb moisture, the moisture condenses on the cold surfaces. Moist areas are created, which form the ideal breeding ground for mold. Once the mold is in the building, it can only be removed with greater effort. It is therefore advisable to install a decentralized ventilation system. The regularly required air exchange takes place automatically and ensures the removal of moisture and the supply of fresh air. This prevents the formation of mold and ensures that the building maintains its value. The warmth of the room air is stored in the integrated ceramic core and, after the fan changes direction, the fresh outside air is warmed up with it. This effectively prevents mold growth, the value of the property is preserved and valuable energy is used efficiently.
Tip: With correct ventilation planning, you as a planner / architect are legally protected and cannot be held responsible for moisture and mold damage due to a missing ventilation concept.
Worth knowing about window rebate ventilation
The goal of many architects, planners and builders is to find an uncomplicated, useful and inexpensive ventilation solution that meets all requirements. Due to the wide range of options, however, it is not always easy to keep track of which solutions really serve their purpose. A frequently offered alternative to decentralized ventilation systems is window rebate ventilation. With this option, part of the window seal is removed and a ventilation gap is built into the window frame. The fresh outside air pulls through the lamella-like opening into the rebate area of the window and flows into the interior at the top between the frame and sash. User-independent ventilation in accordance with DIN 1946-6 is thereby achieved, but this only corresponds to moisture protection ventilation. What many do not know – moisture protection ventilation is only suitable for unoccupied buildings that are not heated. For inhabited buildings, on the other hand, moisture protection ventilation is inadequate and is not sufficient in the ventilation concept either. Anyone who is held responsible for an inadequate ventilation concept or consequential damage is usually the architect or planner.
Additional ventilation via the windows is necessary to achieve reduced ventilation (70% of nominal ventilation) or nominal ventilation. Energy losses, dust, pollen and insect pollution as well as the risk of break-ins must be expected from the additionally required window ventilation. In addition, the incoming air is not heated before it enters the room, as is the case with decentralized ventilation systems from inVENTer. The energy balance of the building deteriorates as a result, which reduces the chances of government funding. In winter, drafts are to be expected with window rebate ventilation. However, only if the building has two opposite sides and there is a sufficient pressure difference. If this is not the case, no air exchange can take place. The airflow is difficult to regulate. The valves close automatically when there is strong wind pressure, but this is not the case when there is a risk of severe air pollution (chemical accidents, major fires, etc.). If the room distribution is unfavorable and the wind direction is poor, kitchen and bathroom smells can spread throughout the apartment. With a decentralized ventilation system, you can regulate the strength and direction of the air flow in a targeted manner. The incoming fresh air is heated by the ceramic heat accumulator. Additional window ventilation is not required. A ventilation concept based on nominal ventilation (comfort ventilation) can be created without any problems. The energetic data can be used to apply for funding applications or the building application. You can read more about window rebate ventilation in our blog article “Window rebate ventilation or decentralized living space ventilation?”.
Tip: inVENTer creates a ventilation concept including all energetic data free of charge – so that you are on the safe side.