Which residential ventilation system is the right one for you?

Whether it’s used in a detached house, an apartment building, a new build, or a building that has been modernised for energy efficiency, controlled residential ventilation conveys used air and humidity to the outside, allowing fresh air to flow in at a pleasant temperature. It ensures the very best indoor climate is maintained and helps to prevent mould. Either central or decentralised ventilation systems are suitable for this purpose.

This guide provides you with an overview of which residential ventilation system is suitable for which building and is designed to help you choose one. It is supplemented by a list comparing purchase costs, space requirements, installation effort, and energy efficiency.

Benefits of controlled residential ventilation:

  • Central or decentralised ventilation units in many different versions
  • For new builds and retrofitting projects, for detached houses and blocks of flats, for small and larger housing units
  • Automatically fresh air, with dust and pollen filtered out
  • 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

Central residential ventilation

In new builds, central residential ventilation is already taken into account in the construction plans and corresponding cut-outs are factored in. The piping for the central ventilation system is also included in the construction plans.

The ventilation unit can be in the attic, cellar, or plant room. The ventilation pipes are laid in the floor structure or in the concrete ceiling during the shell construction.

The heat recovery process recovers the heat from the extract air, creating a healthy climate in the building and saving energy.

Suitable central residential ventilation

  • x-well S-series – depending on model
  • with up to approx. 125 m² living space
  • with up to approx. 175 m² living space
  • with up to approx. 240 m² living space
  • with up to approx. 350 m² living space
x-well central residential ventilation – a healthy indoor climate for any living situation.

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 WCs 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 for operation at slow speeds.

Thanks to the different variants and configuration options available, the x-well single-pipe fans meet all residential building requirements. In conjunction with outer wall air 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
  • x-well ALD13 outer wall air vent

Decentralised residential ventilation

in a combination of extract air fans and pendulum fans

With a decentralised ventilation system combining extract fans (single-pipe fans and small room fans) and pendulum fans, individual rooms or areas can be ventilated independently of each other.

The advantage of this is that rooms which are not frequently used (such as guest rooms) 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 fan
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
  • x-well D13 pendulum fans
x-well decentralised residential ventilation – retrofitted or planned right from the start.

Central residential ventilation

with central arrangement

When new block of flats is being constructed, it is possible to install controlled residential ventilation for all the housing 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 living space
  • with up to approx. 350 m² living space
x-well S-series central residential ventilation – compact ventilation units for comfortable residential ventilation in new builds.

Central residential ventilation

with decentralised arrangement

When a new block of flats is being built, it is possible to install a central ventilation system for each housing unit. This means that different living spaces can be catered for and the appropriate ventilation unit used in each case. If each flat has its own ventilation unit, this eliminates the need for time-consuming planning and implementation with regard to fire protection.

x-well central residential ventilation – a healthy indoor climate for any living situation.

Decentralised residential ventilation

with a combination of extract air fans and pendulum fans

With the use of pendulum fans in a new-build block of flats, each housing unit can be operated with cross ventilation.

There is relatively little work involved in planning and implementation with regard to fire protection in the case of this ventilation system.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fan
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
  • x-well D13 pendulum fans
x-well decentralised residential ventilation – simple, cost-effective, and maintenance-friendly.

Decentralised residential ventilation

with a combination of extract air fans and ALDS

When a new block of flats with interior bathrooms is being built, it is possible to plan a ventilation shaft during the construction phase and connect an extract air fan to the ventilation shaft in the bathroom.

The use of outer wall air vents provides a flow of supply air. This supplies the entire housing unit 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
  • x-well ALD13 outer wall air vent
x-well ALD13/ALD12/ALD11 outer wall air vent for decentralised residential ventilation

Central residential ventilation

When a detached house is being modernised, a central ventilation system can be retrofitted if core renovation is taking place.

If there is a suspended ceiling already or one is being installed, the ventilation ducts can be laid behind it. If this is not the case, more work and planning will be involved because the ventilation duct piping will need to be covered.

Suitable central residential ventilation

  • x-well S-series – depending on model
  • with up to approx. 125 m² living space
  • with up to approx. 175 m² living space
  • with up to approx. 240 m² living space
  • with up to approx. 350 m² living space
x-well central residential ventilation – a healthy indoor climate for any living situation.

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 a breeze.

When carrying out renovations, all the units are placed in the walls using a simple core drilling process.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fan
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
  • x-well D13 pendulum fans

Decentralised residential ventilation

in a combination of extract air fans and outer wall air vents

The x-well A20 and x-well A21 single-pipe fans (extract air fans) are designed for decentralised ventilation of individual rooms. They are ideal for WCs 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. This means that the entire building is supplied with fresh air in conjunction with outer wall air vents or pendulum fans.

The outer wall air vents 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
  • x-well ALD13 outer wall air vent
x-well decentralised residential ventilation – A21/A20 single-pipe fans

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. The unit as a whole operates by means of

all rooms adjacent to the corridor being connected to the central ventilation unit via ventilation ducts, providing central ventilation.

Suitable central residential ventilation

  • x-well F-series – depending on model
  • with up to approx. 90 m² living space
  • with up to approx. 120 m² living space
  • with up to approx. 210 m² living space
F-series x-well central residential ventilation with heat recovery.

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.

All the extract air fans can be positioned in the walls using simple core drilling – a real benefit for renovation projects.

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fan
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
  • x-well D13 pendulum fans
x-well decentralised residential ventilation – retrofitted or planned right from the start.

Decentralised residential ventilation

in a combination of extract air fans and outer wall air 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, making them ideal for WCs 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 variants and combinations available, the x-well single-pipe fans meet all residential building requirements.

The entire building can also be ventilated in conjunction with outer wall air vents or pendulum fans. 

Suitable decentralised residential ventilation

  • x-well A20 single-pipe fans
  • x-well A21 single-pipe fans
  • x-well A12 small room fan
  • x-well D11 pendulum fans
  • x-well D12 pendulum fans
  • x-well D13 pendulum fans
  • x-well ALD11 outer wall air vent
  • x-well ALD12 outer wall air vent
  • x-well ALD13 outer wall air vent