Installing a concealed HRV system requires a creating a recess in the perimeter wall where the ventilation system will be positioned, which needs to served by the power supply. The hole dimensions are available in a reserved area.
Flow40
Decentralised concealed HRV system without ducting, featuring a modular configuration thanks to multiple customisation options. It efficiently renews and purifies indoor air while ensuring an almost invisible design. Also available with window-side grille outlets for seamless integration.
The recessed ventilation system that is there but out of sight
An invisible HRV, which combines excellent air exchange and purification performance with zero footprint: “disappearing” inside the wall, Flow40 does not require piping or false ceilings and leaves only the front cover visible.Single-room ventilation allows you to adjust functions and performance based on the actual needs of each room, ensuring efficient system management and personalised comfort.
The invisible solution!
Up to 91% heat recovery
Advanced air filtration
Hygrometric sensor for humidity control
Price upon request
With Flow40 we can integrate an air exchange system even with no space available for ducting and technical compartments. The ductless design requires no air network adjustment, simplifying the commissioning and long-term management of the system.
Alessio C. - technical manager, F.lli Beltrame
Flow40 offers all the benefits of Heat Recovery Ventilation, simplifying the design and minimising the aesthetic impact, dimensions and maintenance.
Ideal for renovations and energy upgrades
The use of prefabricated components and the absence of air distribution networks makes this wall-recessed HRV system particularly easy to design and versatile to install during residential renovation or energy upgrading. The Flow40 ventilation system can be installed on walls of variable thickness (minimum 335 mm), both with plaster finish and with insulation.
Thermal heat recovery efficiency for every climate
Helty introduces a new heat exchanger technology, allowing the choice between enthalpic (perfect for colder climates) or sensible (ideal for milder climates). The sensible heat exchanger is suitable for temperate climates, where humidity control is not a priority and maximising pure thermal exchange efficiency is essential.
In cold climates, the enthalpy heat exchanger ensures maximum benefit by limiting heat losses (thanks to hermal recovery of up to 91%) and contributing to humidity balance. Maximum comfort is also ensured in terms of acoustic protection, thanks to high façade sound attenuation and a sound pressure level of just 18 dB at the first speed. The absence of air ducts avoids acoustic bridges and noise transfer between rooms.
Prevention against condensation, mould and pollutants
The HRV unit is also equipped as standard with a humidity sensor for continuous detection of relative humidity in the room, enabling automatic and more efficient regulation of forced ventilation to counteract the formation of condensation and mould.
CO₂ and IAQ sensors are available, along with Modbus RS485 connectivity and Helty Home app control, allowing full management of settings and real-time monitoring of temperature, humidity and pollutant levels – so indoor air quality in every room is always under control, throughout the day.
Flow40 HRV windows-side
Helty Flow40 HRV with grilles exit on the side of the window frame is the innovative concealed solution that is even more invisible and discreet, thanks to the possibility of managing the grille exits directly in the window shoulder.
A system that has no visible impact on the facade, preserving the integrity of any type of building. Flow 40 with light exit is an interesting and versatile option for major renovations and new construction sites in contexts that require special attention to architectural aesthetics. The system can also be planned in the construction phase alone, to be completed at a later date as required.
Greater configuration possibilities
Helty Flow40 expands its configuration options to best adapt to each project. This approach allows designers to create the ideal solution for every construction site by modularly combining different elements: installation kit, heat exchanger type, cover, sensors, accessories and HRV unit control. This new setup offers an unprecedented range of possibilities to meet every requirement, with a flexible approach aimed at simplifying system planning and reducing complexity.
Minimal design, with new covers
Helty expands the range of covers for the concealed Flow40 HRV, offering new solutions designed for perfect architectural integration. It is now possible to choose between elegant sheet metal covers, with standard keypad or blind version, or flush-to-wall covers, ideal for an even more minimal and discreet effect. White or glossy black PMMA versions remain available, offered as standard with integrated keypad or in the new blind variant. This variety allows the aesthetic of the HRV to be customised according to the style of the environment – achieving a perfect balance between design, comfort and technology for healthy air that blends seamlessly with interior design.
Advanced features for safety, efficiency and comfort
Flow40 integrates a range of advanced functions designed to simplify daily operation. The power disconnection system ensures automatic shutdown of the unit when the front cover is removed, increasing safety during maintenance operations. Anti-frost protection with automatic reset ensures correct operation even in the harshest climatic conditions. In addition, when temperature conditions allow, Flow40 intelligently activates automatic free cooling, using outdoor air to naturally cool indoor spaces without additional energy consumption—contributing to indoor comfort and overall energy efficiency.
Technical data
| Characteristics | U.M. | Value | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Airflow (1) | m3/h | 8/10/17/26/37/42* | ||||||||||||||||||||||||||||||||||||
| Airflow adjustment | night function + 4 settings + high-speed ventilation | |||||||||||||||||||||||||||||||||||||
| Power consumption | W | 2/3.6/5.5/9/17.5/20 | ||||||||||||||||||||||||||||||||||||
| Supply voltage | V AC | 230 | ||||||||||||||||||||||||||||||||||||
| Max. current consumption (2) | A | 0.15 / 0,25* | ||||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||||
1. In high-speed ventilation mode2. With sensible heat exchanger3. With *dampers and **pre-heater4. Measured on a 30 m² semi-anechoic environment at a distance of 3 m
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Discover Flow40 with the 3D Configurator
Would you like to learn more about the concealed Helty Flow40 MVHR system and understand how it can be integrated into your project? Explore the new 3D configurator dedicated to Flow40: an interactive experience that offers a virtual tour of the solution, with specific insights into the installation, use, and maintenance of the MVHR system.
*For the best experience, we recommend browsing from a desktop device.
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Frequently asked questions
Flow40 concealed HRVs require a perimeter wall with a minimum thickness of 335mm. Flow70 and Flow100 systems require perimeter walls with a minimum thickness of 460mm.
An enthalpy heat exchanger recovers both the sensible thermal energy (the heat) and the latent energy (the humidity) from the air flow. It has the advantage of offering better overall energy efficiency without over-drying the incoming air.
Certified quality and performance
The performance of the Helty ventilation systems are recognized by the Casa Clima Quality Seal and have obtained the SIMA and BioSafe validations
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