Decentralized Ventilation

Can be easily installed in the wall, do not require extensive construction work and effectively solve the problem of ventilation. They alternately supply and extract air, and their appearance and operation makes them almost completely inconspicuous. The devices work continuously at the lowest level, except when humidity increases or if you increase the power manually.

Decentralized ventilation units with heat recovery use a ceramic heat exchanger to transmit heat from the exhaust air to the supplied air. We distinguish between devices that simultaneously supply and extract air and devices that operate alternately. The term “decentralized ventilation” is used in practice for all devices that solve the problem of ventilation in a particular area, whether local or decentralized.

Decentralized ventilation devices, which are installed directly in a wall or in a window frame, are suitable especially for the renovation of older buildings. Devices that have the necessary control elements on the device itself are especially useful, since only a power source must be provided. In this case, the devices operate in pairs, however an odd number of devices is also possible. The number of devices must be calculated according to the size of the dwelling and the number of residents. The basic rule is that one heat recovery unit should be installed for every 25 square meters. These devices operate alternately: air is supplied for 70 seconds, then air is extracted for the next 70 seconds; this is how the ceramic heat exchanger is first cooled down and then heated up. The air entering the apartment is heated to a suitable temperature. The figure shows a cross-section of the Ventomaxx WRG Plus LAL, which is built into the window frame and has a ceramic heat exchanger.

The advantages are having fresh air in the apartment with a high level of heat recovery which leads to increased comfort, while only minor construction works are needed. Since there is no need to install air distribution systems, the residential area remains the same, and the devices are small and compact. They can also be hidden in the window frame and are practically imperceptible on the outside and inside. They are also priced more favorably than centralized ventilation systems, and there is no need to clean the ventilation ducts.

Unfortunately, when installing these devices, we are limited by the layout of the room and the positioning of the furniture. Inadequate device layout can impair the ventilation efficiency, while smells from the bathroom and kitchen can spread to other rooms in the event of inappropriate positioning. An individual device has a limited air flow rate and is less suitable for certain types of rooms where there are many people at any given moment.

Below is an example of a layout in a two story residential house. An optimal air exchange level was achieved with respect to the layout while avoiding passing the contaminated air from the kitchen and the bathroom to other rooms. Because the Ventomaxx V-WRG Rondo Plus devices are extremely silent, they are ideal for bedroom installation.

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