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Construction of a decentralized ventilation systemVentilation principle for decentralized ventilation units

According to the technical definition, ventilation is a technical system with which fresh air is fed into rooms or buildings. Ventilation systems can be roughly divided into centralized and decentralized systems. Decentralized ventilation systems for living spaces are designed in such a way that the ventilation units are divided in pairs in different positions within a residential unit. The first step for the installation of a decentralized ventilation system is the planning and calculation of the necessary air volumes.

After that, the fans must be installed in the outer wall. In new buildings, bricks are left out or wall mounting blocks are used to create an opening for the device. In the case of renovations, an opening is drilled into an existing wall using a core hole. The wall sleeves are foamed into the resulting openings, the heat storage unit with fan is inserted and finally the system is covered on the outside and inside with a weather protection hood or inner panel.

How does a decentralized ventilation system with heat recovery work?

Wandeinbau einer dezentralen Lüftung und deren Funktion

The function of living space ventilation is as follows: In decentralized ventilation systems for living spaces, the ventilation devices are always used in pairs. It is not always necessary to place two fans in one room. They can “communicate” with one another through overflow openings, e.g. through a small door gap. This principle is called cross ventilation – it ensures that the living space is effectively flowed through with fresh air.

Querschnitt von Wandeinbau einer dezentralen Lüftungsanlage

The function of living space ventilation is carried out by the ventilation devices, which work in push-pull: The reversing fan of a ventilation device rotates in one direction for 70 seconds and transports the stale air to the outside. The ceramic heat accumulator stores the heat from the air from the interior. Then the direction of rotation of the fans of both ventilation units changes. Fresh air now flows into the living room from outside. The ceramic releases the stored heat back into the fresh air – called heat recovery. This means that up to 93 percent of the heat can be retained. This function of living space ventilation is also known as the push / pull principle due to the different air directions.

Die Funktion einer Wohnraumlüftung und das Prinzip dezentraler Lüftungsanlagen von inVENTer

Structure of a decentralized ventilation unit

A decentralized ventilation device basically consists of the following components: inner cover, reversible fan, ceramic heat storage, wall sleeve and weather protection hood. There are also systems in which the air is exchanged via a cross-flow heat exchanger. The structure and function of the ventilation system can be found in the following table:

Accessories and controllers for ventilation systems for living spaces with heat recovery

Accessories for decentralized ventilation systems

A large number of accessories are available for decentralized ventilation systems. There are additional filter systems as well as noise protection and wind protection measures for inVENTer ventilation systems. For allergy sufferers or for special circumstances (e.g. high levels of fine dust pollution), both pollen and fine filters can be retrofitted, the activated carbon filter keeps bad smells away. Sound insulation is often a special requirement – this can be improved in inVENTer ventilation systems with a sound insulation insert, sound insulation insert and sound protector. The wind protection plays a role especially in coastal areas – it is recommended to install the wind protection insert in the wall sleeve.

Controller for decentralized ventilation units

Controllers are connected to the individual ventilation devices in a decentralized system. These ensure that the fans are connected to each other and run in the right direction. In this way, the decentralized ventilation system can be controlled as required. The controllers have different functions. Simple control via a touch-sensitive user interface (touch surface) is just as possible as setting up individual ventilation zones using our premium controller, with which the ventilation is pre-programmed to precisely meet the needs of the residents with the help of a weekly timer.

Function of pure extract air devices for ventilation

Exhaust air devices discharge stale air from the living space to the outside, they only work in one direction and without heat recovery. Exhaust systems are often used in bathrooms, storage rooms or infrequently used rooms. But there is also the option of equipping entire residential units with exhaust air systems.

When used in the bathroom, the devices only run intermittently. The exhaust air devices are equipped with humidity sensors, light sensors or overrun switches and are particularly in operation when required, e.g. B. after showering or if the humidity rises for other reasons.

In storage rooms or seldom used rooms, the devices are intended for permanent operation. In addition to the exhaust air devices, which usually bring air to the outside 24 hours a day, air outlets are built into the outer walls of the residential unit, through which fresh air can flow in. This effectively prevents mold and moisture. It should be noted, however, that no heat recovery takes place.

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