A central ventilation system with heat recovery (HRV) ensures continuous and controlled air exchange throughout the entire building unit. Fresh outside air is filtered, tempered and distributed into living spaces via an air distribution system, while stale air is simultaneously removed from kitchens, bathrooms and adjacent rooms.
The result is an energy-efficient ventilation system that reduces heat loss, regulates humidity and ensures a stable and hygienic indoor climate in the long term.
How does central ventilation with heat recovery (HRV) work?
The operating principle is based on a closed supply air and exhaust air system with a central ventilation unit.
- Outside air is drawn in and filtered
- The air flows through a heat exchanger
- It is preheated by the exhaust air
- It is then distributed into the rooms
- At the same time, stale air is removed from kitchens, bathrooms and adjacent rooms
The key point:
Supply air and exhaust air flows remain completely separated. This prevents the transfer of odours or pollutants. When using an enthalpy heat exchanger, as in the SEPHYR 250Z, part of the humidity can additionally be transferred from the exhaust air to the supply air. This prevents excessively dry indoor air in winter and supports a balanced indoor climate.
Advantages of a central ventilation system in the building
A central ventilation system with heat recovery (HRV) offers several technical and economic advantages:
- reduction of ventilation heat losses by over 90%
- constant fresh air supply independent of user behaviour
- protection of the building structure through controlled moisture removal
- reduction of odours and CO₂ concentration
- even air distribution across multiple rooms
In addition, central airflow routing enables a clear system structure that simplifies planning and operation. Especially in modern, airtight building envelopes, a controlled ventilation system is no longer just a comfort feature but a technical necessity.
Enthalpy heat exchanger: efficient use of heat and humidity
A key difference in modern ventilation systems lies in the type of heat exchanger used. While conventional systems transfer only heat, an enthalpy heat exchanger also utilises the moisture contained in the exhaust air. The SEPHYR 250Z uses a high-performance enthalpy heat exchanger that combines both effects.
This means:
- heat from the exhaust air is transferred to the supply air
- part of the humidity is also recovered
- the supply air is not only tempered but also conditioned
In practice, this offers a clear advantage. During the heating season, dry outside air is noticeably balanced through moisture recovery. This reduces the risk of excessively dry indoor air and has a positive effect on comfort, materials and the indoor climate.
Technical benefits at a glance:
- heat recovery (HRV) of over 90% significantly reduces heating energy demand
- moisture recovery stabilises the indoor climate
- no mixing of supply air and exhaust air flows
- hygienically safe airflow routing without odour transfer
Practical relevance for planning and operation:
An enthalpy heat exchanger not only reduces energy losses but actively improves indoor air quality within the building. This creates a system that is both energy-efficient and building-physically effective. In combination with central air distribution, this results in a complete solution designed for efficiency, comfort and operational reliability.
Installation and system integration in practice
The installation of a central ventilation system with heat recovery (HRV) has a decisive influence on the overall system performance. The key factor is the interaction between the ventilation unit, air distribution and coordinated components. The ventilation unit is centrally positioned within the building, typically in a plant room, utility room or basement. From there, air is distributed to all relevant rooms via a structured duct system.
Installation in practice:
- central positioning of the unit for short duct routes
- clear separation of supply air and exhaust air routing
- integration into ceilings, shafts or installation zones
- connection to a continuous air distribution system
The SEPHYR 250Z is specifically designed for installation-friendly implementation.
Key installation advantages:
- low weight simplifies handling on site
- installation possible by a single person
- up to 144 configuration options for different installation situations
- flexible adaptation to various building types
This not only reduces installation time but also minimises typical sources of error.
System integration:
A key advantage lies in the combination of the ventilation unit with a coordinated air distribution system. With a suitable duct system such as VENTOFLEX, a complete solution is created:
- structured airflow routing throughout the building
- coordinated components from unit to outlet
- reduced interfaces between trades
- simplified planning and execution
Extension options:
- reheating coil for additional temperature control
- CO₂ sensors for demand-based control
This modular system structure allows central ventilation to be precisely adapted to the respective project – from planning through to commissioning.
Conclusion: efficient use of central ventilation with heat recovery (HRV)
A central ventilation system with heat recovery (HRV) ensures controlled air conditions in the building unit, reduces energy losses and supports a consistently stable indoor climate. Systems with enthalpy heat exchangers offer additional advantages in humidity control and increase comfort in everyday operation.
Frequently asked questions about central ventilation with heat recovery (HRV)
How does central ventilation with heat recovery (HRV) work?
A central ventilation unit supplies fresh outside air and removes stale air. A heat exchanger transfers heat from the exhaust air to the supply air without mixing the airflows.
How high is the heat recovery (HRV) in practice?
Modern systems achieve over 90% heat recovery (HRV), significantly reducing energy loss through ventilation.
What is the advantage of an enthalpy heat exchanger?
In addition to heat, humidity is also transferred. This creates a more balanced indoor climate, especially in winter, and prevents excessively dry air.
Is central ventilation suitable for existing buildings?
In principle, yes – but with limitations. Central ventilation with heat recovery (HRV) is possible in existing buildings but requires significantly more planning and structural effort than in new builds.
How complex is the installation?
With coordinated components and flexible systems, installation is predictable and efficient to implement, both in new builds and modernisation projects.
