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- Elimination of fungi and mold already after one month of use.
- The guaranteed heat retention of up to 91% when ventilating!
- Safe ventilation with 17 operation modes.
- The decentralized heat recovery unit is totally invisible on the facade!
- Quality components are mainly from Europe.
Distinguishing features of Ventoxx Invisible HRV over the other decentralized heat recovery units of Ventoxx™
- The only wall-mounted decentralized heat recovery unit that is totally invisible on the façade of the building.
- It's installed only in buildings with external thermal insulation.
- It has five speeds and 17 operating modes.
- The air duct of this decentralized heat recovery unit is made in the form of a stacked-rings pipe, allowing you to fit the air duct without cutting, connecting the pipe segments to the required wall thickness.
- G3 class air filter is washable and can be used repeatedly.
- User-friendly wall-mounted Ventoxx Twist control fits perfectly into any interior.
| Number of modes | 17 |
| Number of speeds in reverse | 5 |
| Ventilation volume, m³ per hour | 1st speed – 16 2nd speed – 27 3d speed – 38 4th speed – 46 5th speed – 54 |
| Ventilation volume in the Maximum ventilation mode, m³ per hour | 80 |
| Recovery efficiency, % | 1st speed – 74 2nd speed – 77 3d speed – 81 4th speed – 86 5th speed – 91 |
| Noise level at a distance of 1 m, dBA | 1st speed – 21 2nd speed – 26 3d speed – 28 4th speed – 30 5th speed – 32 |
| Noise level at a distance of 3 m, dBA | 1st speed – 12 2nd speed – 14 3d speed – 17 4th speed – 21 5th speed – 23 |
| Street noise suppression, dB | 39.3 |
| Voltage | 230 VAC or 12 VDC |
| Operating voltage, VDC | 7 to 15 |
| Power consumption, Вт | 1,6 to 2,75 |
| Power consumption at maximum ventilation, W | 4,78 |
| Type of heat exchanger | high-tech heat exchanger (Germany) |
| Mounting hole diameter, mm | not less than 235 |
| Temperature range, °C | -20 to +50 |
| Dimensions | Stacked-rings pipe: Diameter – 226 mm Minimum length – 300 mm Inner cover: diameter – 240 mm Outer cover: 290 х 280 mm Outdoor air duct: 500 х 250 х 60 mm |
| Placement method | Horizontal placement in the outer wall |
| Maintenance | The filter does not require replacement. The heat exchanger cartridge and filter must be checked for cleaning every 3 months. |
| IP | |
| Fan | IP 33 |
| Control | IP 20 |
| Filter | G3 |
Advantages of Ventoxx Comfort Invisible HRV
- It’s a perfect solution for installations with complex facades or exquisite architecture.
- More simple and cheaper installation with using preparatory and mounting sets.
- User-friendly wall-mounted relay control.
- Has been tested in independent laboratories in Germany.
The design of the decentralized heat recovery unit provides ducting out into the thickness of the insulating layer of the wall, which allows hiding the air grid in the window jamb. What we get as a result: effective ventilation and removal of excess moisture, as well as protection against mold in the building, with no visible air duct covers from the outside.

Ventoxx Invisible HRV is available in two options:
- Invisible on the facade installation based on the Ventoxx Comfort HRV.
- Invisible on the facade installation based on the Ventoxx Harmony HRV.
These models are different by the diameter of their air duct, the type of unit inner cover, the type of control and some technical characteristics. When selecting the option, refer to the information about the original model of the decentralized heat recovery unit, then add the option “Invisible” to the order.


When using the option of preparatory and mounting sets, property developers have the opportunity to install air ducts during the masonry phase of the building walls. This option not only makes installation cheaper in most situations (no need to drill holes afterward) but also guarantees the protection of sensitive elements of the decentralized heat recovery unit from possible contamination and damage during construction and/or interior finishing. The mounting kits are installed at the stage of cladding the building with thermal insulation and/or during the fine finishing of apartments.
The decentralized heat recovery unit is controlled by the Ventoxx Twist wall-mounted control or remote control in the case of the Ventoxx Harmony-based option.
Components: Ventoxx Comfort Invisible HRV based on the Ventoxx Comfort

1 – inner cover
2 – G3 class air filter
3 – plastic mounting frame for the cover
4 – cartridge with a reversible fan
5 – ceramic heat exchanger in thermal insulation
6 – telescopic air duct made of stacked rings
7 – the final element of the air duct
8 – air duct with outer grid
9 – control relay
10 – under plaster box
11 – wall-mounted control frame
12 – power supply unit.
Components: Ventoxx Harmony Invisible HRV based on the Ventoxx Harmony

1 – movable part of the inner cover
2 – a mounting plate with indication of current operating mode
3 – G3 class air filter
4 – Ventoxx Star noise attenuation element *
5 – cartridge with a reversible fan
6 – ceramic heat exchanger in thermal insulation
7 – air duct
8 – back output diffuser(outer) grid
9 – remote control.
Dimensions: Ventoxx Comfort Invisible based on Ventoxx Comfort

Dimensions: Ventoxx Comfort Invisible based on Ventoxx Harmony
