The HRU-FlatAIR-X series represents a new generation of high-efficiency Mechanical Ventilation with Heat Recovery (MVHR) units, specifically engineered for flush-mounting applications in modern studios and smaller apartments. Designed to meet the stringent demands of both central and decentralised ventilation systems, these units combine exceptional thermal performance, low noise operation, and maximum installation flexibility. The robust, self-supporting housing is constructed from EPP (Expanded Polypropylene), a material renowned for its superior durability, lightweight characteristics, and outstanding thermal and acoustic insulation properties, ensuring quiet and energy-efficient operation (Sound power level LWA starting from 46 dB(A)).
Core Performance and Exchanger Technology
The HRU-FlatAIR-X line offers a critical choice of heat recovery technology to match specific project requirements, ensuring optimal air quality and energy savings:
Standard Heat Exchanger: Features a high-performance Counterflow Plastic (PET) heat exchanger, achieving maximal thermal efficiency of up to 94.6%.
Enthalpy Exchanger Models: Available in 'E' variants (e.g., HRU-FlatAIR-X-80E), these units incorporate an enthalpy heat exchanger capable of recovering both heat and moisture (maximal moisture efficiency up to 76.5%), maintaining a comfortable and healthy humidity level within the home.
Key Technical Specifications (Summary)
Selected Technical Data for HRU-FlatAIR-X Models @ 100 Pa
Model Range
Max Air Flow [m3/h]
Maximal Efficiency [%]
Max Power Input [W]
Sound Power LWA [dB(A)]
HRU-FlatAIR-X-80/80E
80
94.6 / 89.3
29
46
HRU-FlatAIR-X-100/100E
100
94.6 / 88.6
48
50
HRU-FlatAIR-X-125/125E
125
93.4 / 87.6
72
52
Efficiency figures are according to EN 13141-7:2010. All models feature an 800W built-in electric pre-heater and a built-in RH sensor.
Installation Flexibility for Technicians and Architects
The unique design of the HRU-FlatAIR-X prioritises ease of installation and versatility, making it a preferred choice for installers facing space constraints:
Duct Connection System: Interchangeable spigots allow for standard 100mm duct installation or direct connection of 75mm semi-rigid FLX ducts (4 per supply/exhaust). This innovation eliminates the need for expensive manifolds, drastically reducing installation costs and saving valuable space.
Mounting Versatility: Units support Suspended, Vertical, and Horizontal installation orientations (model-dependent).
Versatile Duct Routing: The inlet and outlet ducts can be connected on three sides of the unit, facilitating both flush-mounted and surface-mounted setups in diverse architectural layouts.
Advanced Control and System Stability Features
Control and system management are robust, providing both end-user convenience and technical integrity:
Constant Flow (CF) System: Optional CF models (e.g., HRU-FlatAIR-X-80-H-CF) ensure the system maintains a constant, pre-set airflow regardless of increasing resistance (e.g., dirty filters or condensation). This feature is critical for the long-term, sustainable performance of the ventilation system.
Smart Home Integration: Units are compatible with a range of wired controllers, including the HRQ-BUT-LCD-P5, and support integration with Wi-Fi and popular Smart Home systems like LOXONE and Modbus.
Integrated Components: Standard equipment includes a built-in RH sensor for automatic humidity control, an **automatic, modulated by-pass**, and a built-in 800W electric pre-heater for frost protection.
External Connections:
Provision for connecting a Ground Heat Exchanger (GHE) with a dedicated damper (DATVTML) for pre-heating/cooling air.
X25 potential-free contact on the main board for direct connection and exhaust fan shutdown upon activation of a kitchen cooker hood.
Filtration: Equipped with ISO Coarse 70% and optionally ISO ePM1 55% filters (pleated design for lower pressure drops). Filter status is visually indicated by a LED light on the unit and controller.
Energy Efficiency and Compliance (Investor View)
The HRU-FlatAIR-X series is an excellent investment, offering significant operational savings and compliance with current standards:
The entire range achieves high energy ratings, with many configurations reaching Energy Class A or A+, depending on the control method used (Central or Local demand control).
