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What residential ventilation is the right one?

Whether it's a single-family house or a multi-family house, a new-build or a building that has been modernized for energy efficiency – controlled residential ventilation automatically conveys used and humid air to the outside, allowing fresh air to flow in at a pleasant temperature. It ensures optimal thermal comfort and helps to prevent mould. Either centralized or decentralized ventilation systems are suitable.

This guide will provide you with an overview as to which residential ventilation system is suitable for which building and should help you choose one. It is supplemented by a list comparing acquisition costs, space requirements, installation effort, and energy efficiency.

Benefits of controlled residential ventilation:

  • Central or decentralised ventilation units in many different designs
  • For new-builds and retrofitting, for single-family houses and multi-family houses, for small and larger residential units
  • Automatically fresh air, filtered from dust and pollen
  • Ideal for people with allergies
  • Protects the building fabric because mould is prevented in modern, airtight buildings
  • Heat recovery  saves heating energy and protects the environment.
  • Extremely quiet during operation

I am planning to build a new single-family house

New-build single family house

Central residential ventilation

In new buildings, central ventilation is already taken into account in the construction plans and corresponding cut-outs are planned. The piping for the central ventilation system is also included in the construction plans. The ventilation unit can be in the attic, basement, or plant room. The ventilation pipes are laid in the floor structure or in the concrete ceiling during the shell construction. Heat recovery recovers the heat from the extract air, thus creating a good climate in the building and saving energy.

Suitable central residential ventilation

  • x-well S-series – depending on model
    • with up to approx. 125 m² floor space
    • with up to approx. 175 m² floor space
    • with up to approx. 240 m² floor space
    • with up to approx. 350 m² floor space
Ventilation table central

Decentralised residential ventilation in a combination of single-pipe fans and outer wall air vents

The x-well A20 and x-well A21 single-pipe fans are designed for decentralised ventilation of individual rooms – ideal for internal toilets and bathrooms. They reliably convey used and humid air to the outside through a duct. The fans run extremely smoothly and quietly, as they are designed to be run at slow speeds. Thanks to the different versions and configuration options, the x-well single-pipe fans meet all residential building requirements. In conjunction with outer wall vents, the entire building can also be ventilated.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well ALD11 outer wall air vent
  • x-well ALD12 outer wall air vent
Ventilation table decentralised with ALDs

Decentralised residential ventilation in a combination of extract air fans and pendulum fans

With a decentralised ventilation system with the combination of extract fans (single-pipe fans, small room fans) and pendulum fans, individual rooms or areas can be ventilated independently of each other. This has the advantage that rooms that are not frequently used (for example a guest room) can only be ventilated for moisture protection at the base load.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fans
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
Ventilation table decentralised with pendulum fans

I am planning to build a new multi-family house with apartments with up to approx. 120 m² floor space

Multi-family house

Central residential ventilation with central arrangement

When building a new multi-family house, it is possible to install controlled residential ventilation for all residential units. This means that only one ventilation system needs to be maintained in a central  plant room.

Suitable central residential ventilation

  • x-well S-series – depending on model
    • with up to approx. 240 m² floor space
    • with up to approx. 350 m² floor space
Ventilation table central

Central residential ventilation with decentralised arrangement

When building a new multi-family house, it is possible to install a central ventilation unit per residential unit In this way, different living spaces can be catered for and the appropriate ventilation unit can be used. If each apartment has its own ventilation unit, which can eliminate the need for time-consuming planning and implementation with regard to fire protection.

Ventilation table central with decentralised arrangement

Decentralised residential ventilation with a combination of extract air fans and pendulum fans

With the use of pendulum fans in a new-build multi-family house, the respective residential unit can be operated with cross ventilation. The effort for planning and implementation with regard to fire protection for such a ventilation system is relatively little.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fans
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
Ventilation table decentralised with pendulum fans

Decentralised residential ventilation with a combination of extract air fans and ALDS

When building a new multi-family house with interior bathrooms, it is possible to plan a ventilation shaft during the construction phase and to connect an extract air fan in the bathroom to the ventilation shaft. The use of outer wall vents in the outer wall ensures a supply air flow. The entire residential unit is thus supplied with fresh air.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well ALD11 outer wall air vent
  • x-well ALD12 outer wall air vent
Ventilation table decentralised with ALDs

I am modernising a single family house

Kermi x-well house decentralised ventilation D12

Central residential ventilation

When modernising a single-family house, a central ventilation system can be retrofitted in the case of a core renovation. If a suspended ceiling exists or is being installed, the ventilation ducts can be laid behind it. If this is not the case, this will involve more work and planning because the piping of the ventilation ducts will need to be covered.

Suitable central residential ventilation

  • x-well S-series – depending on model
    • with up to approx. 125 m² floor space
    • with up to approx. 175 m² floor space
    • with up to approx. 240 m² floor space
    • with up to approx. 350 m² floor space
Ventilation table central

Decentralised residential ventilation with a combination of extract air fans and pendulum fans

The Kermi x-well D11 and x-well D12 pendulum fans (extract air fans) make retrofitting particularly easy. During renovation, all the devices are positioned in the walls using simple core drilling.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fans
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
Ventilation table decentralised with pendulum fans

Decentralised residential ventilation in a combination of extract air fans and outer wall vent

The x-well A20 and x-well A21 single-pipe fans (extract air fans) are designed for decentralised ventilation of individual rooms. Ideal for toilets and bathrooms, because they reliably convey used and humid air to the outside. The fans run extremely smoothly and quietly, as they are designed to be run at slow speeds. Thus the entire building is supplied with fresh air in conjunction with outer wall vents (ALDs) or pendulum fans. The ALDs are positioned in the outer walls using simple core drilling.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well ALD11 outer wall air vent
  • x-well ALD12 outer wall air vent
Ventilation table decentralised with ALDs

I am modernising a small to medium-sized multi-family house with apartments with up to approx. 120 m² floor space

Multi-family house

Central residential ventilation

The flat ventilation units in the x-well F-series can be hidden in a suspended ceiling for example. Or in a wall cupboard in the kitchen or a utility room. Technically, the whole thing works as follows: All rooms adjacent to the corridor are connected to the central ventilation unit via ventilation ducts and are thus centrally ventilated.

Suitable central residential ventilation

  • x-well F-series – depending on model
    • up to approx. 90 m² floor space
    • up to approx. 120 m² floor space
Ventilation table central

Decentralised residential ventilation with a combination of extract air fans and pendulum fans

Above all, the x-well D12 pendulum fan makes retrospective installation easy. Benefit during renovation: All the extract air fans can be positioned in the walls using simple core drilling.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fans
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
Ventilation table decentralised with pendulum fans

Decentralised residential ventilation in a combination of extract air fans and outer wall vents or pendulum fans

The x-well A20 and x-well A21 single-pipe fans are designed for decentralised ventilation of individual rooms. They reliably convey used and humid air to the outside through a duct and are therefore ideal for toilets and bathrooms. The extract air fans run extremely smoothly and quietly, as they are designed to be run at slow speeds. Thanks to the different versions and combinations, the x-well single-pipe fans meet all residential building requirements. The entire building can also be ventilated in conjunction with outer wall vents (ALDs) or pendulum fans.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fans
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
  • x-well ALD11 outer wall vent
  • x-well ALD12 outer wall vent
Ventilation table decentralised with ALDs