Ventilation with heat recovery

Contemporarily constructed buildings with a well-sealed building envelope (contact with the walls, windows, doors) have an extremely low air permeability, thus requiring proper ventilation of the building. Insufficient ventilation results in unhealthy living and structural-physical conditions. Unplanned and random airing of spaces often means a loss of the energy invested into heating the air. The solution to the problem is comfortable and reliable ventilation systems.
Marles technology allows for comfortable ventilation that automatically and continuously ventilates the entire house. This rids us of the need to open windows.

The advantages of controlled ventilation: 

  • continuous fresh air in all rooms,
  • no unpleasant odours,
  • significant savings on heating costs,
  • prevents the intrusion of noise into the rooms,
  • no sense of draft, which could otherwise be caused by the supply of cold outside air,
  • the air is filtered and therefore contains no pollen,
  • no problems caused by increased moisture in the rooms, in particular bathrooms, thereby providing increased durability of the construction materials,
  • greater security because there is no need to open windows.

Controlled ventilation in modern houses is therefore indispensable, so at Marles we decided to give you all the advantages of a controlled ventilation system with heat recovery of exhaust air in our offer of houses.

How does it work?

A ventilation system supplies fresh air to spaces and removes used air. Heat recovery is a process where the heat from used air that is discharged from the building is transferred to the outside air, which is supplied to the building. Recovery means restoring, returning to the previous state. In our case, the heat from waste air is transferred to new fresh air and back into the premises. The most important part of the process is the recovery cube that transfers the heat of waste air into the intake air. The device is equipped with filters to clean air and suck exhaust air from rooms such as the bathroom, kitchen and toilet and feed fresh warm air into the living room, bedrooms, children’s rooms, work room, etc.

Comfort ventilation systems with heat recovery.



Schematic presentation of comfort ventilation intake and outtake tubes.


Graph showing the levels of CO2 in a room with comfortable ventilation and a room with conventional ventilation.


The graph shows the levels of CO2 in ppm (parts per million) in the bedroom in a period of 24 hours. The CO2 concentration rises until a window is opened (orange line). At night, the CO2 concentration rises rapidly when the window is closed. Once the window is opened, it falls below the threshold value and healthy conditions are restored. Such an action is impracticable at night and also unacceptable from the viewpoint of energy. The green line shows the example with built-in comfort ventilation, which always provides an optimum level of CO2 for staying inside the building. In highly efficient and passive Marles houses, the intake of air into the room is controlled by the ventilation system, which replaces a heating system at the same time, as this system allows for very efficient heat recovery.

Schematic diagram of comfort ventilation system with heat recovery.


Presentation of the actual implementation of the comfort ventilation system with heat recovery.