HRU-FlatAIR Series: Compact & Efficient Heat Recovery Units
The HRU-FlatAIR series represents a line of modern, high-efficiency heat recovery units engineered for spaces where performance and compact dimensions are paramount. With a wide capacity range from 80 to 250 m³/h (@100 Pa), these units are the definitive solution for apartments, condominiums, and any project requiring discreet installation within a suspended ceiling. The innovative design ensures full serviceability without the need for disassembly, providing long-term convenience for both technicians and end-users.
Key Benefits for Installers, Architects, and Investors
Ultra-Slim Profile: With a minimal height starting from just 170 mm, the HRU-FlatAIR units can be seamlessly integrated into ceiling voids, preserving maximum usable room height and providing architectural freedom.
Exceptional Efficiency: At the core of each unit is a highly efficient countercurrent exchanger made of PET for maximum thermal recovery, or an advanced enthalpic exchanger for simultaneous heat and moisture recovery. This translates to significant energy savings and high energy class ratings (up to A+).
Advanced Climate Control: An integrated electric pre-heater provides reliable frost protection for the exchanger, while a built-in relative humidity (RH) sensor ensures the automatic maintenance of optimal indoor air quality.
Intelligent Automation: The series offers flexible control via wireless radio communication with a wide range of sensors (CO2, RH, PIR). Full internet connectivity allows for remote management through a dedicated mobile app and integration with smart home systems like Loxone.
Durable & Quiet Operation: The self-supporting casing is constructed from Expanded Polypropylene (EPP), a material renowned for its strength, low weight, and excellent thermal and acoustic insulation properties.
Simplified Maintenance: Thoughtful engineering allows complete access to internal components, including filters and the exchanger, without uninstalling the unit, drastically reducing service time and complexity.
Technical Specifications Overview
The table below summarises the key performance indicators across the entire HRU-FlatAIR product range.
Key Technical Specifications Across the HRU-FlatAIR Range
170 mm (models 80, 100, 125) or 200 mm (models 120, 150-250)
Exchanger Types
Counterflow (PET) or Enthalpic (moisture recovery)
Maximum Thermal Efficiency
Up to 97.3% (model dependent)
Standard Filters
ISO Coarse 70% (supply/extract)
Optional Filters
ISO ePM1 55% for enhanced filtration
Casing Material
Expanded Polypropylene (EPP)
Advanced Features & Integration
The HRU-FlatAIR series is equipped with functionalities designed for modern, sustainable building systems.
Constant Flow (CF) Technology: An optional Constant Flow system maintains a consistent airflow volume by automatically adjusting fan speeds to compensate for pressure changes in the ductwork, such as those caused by filter clogging. This guarantees stable, commissioned performance throughout the service life of the unit.
Kitchen Hood Integration: Units can be connected to a kitchen hood via a potential-free contact, allowing the system to temporarily halt the exhaust fan to optimise extractor performance during cooking.
Ground Heat Exchanger (GHE) Control: The system includes a function to control a dedicated damper, enabling seamless integration with a ground-to-air heating system for enhanced pre-heating or pre-cooling of supply air.
