VRL-C D Premium

Recommended Product:
VRL-C G Premium ventilation for schools
VRL-C G Premium
  • Ventilation for schools, childcare centres, offices and community halls
  • Purifies the air and reduces aerosol concentration
  • Up to 92% heat recovery
  • Easy installation, even in retrofit projects
  • Additional accessories include CO2 sensor, VOC sensor, and motion sensor
View VRL-C G Premium
  • Centralised ventilation unit with heat recovery for schools, childcare centres, offices and community halls
  • Up to 92% heat recovery
  • Ducted installation
  • Additional accessories include CO2 sensor, VOC sensor, and motion sensor
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Product Overview

Ventilation for schools, restaurants and offices

The VRL-C D Premium centralised heat recovery ventilation system recovers up to 92% of the heat that would otherwise be lost through an open window. Installation is simple and can be implemented quickly. In this way, individual devices ensure optimal ventilation of the entire classroom independently of one another — the old air out, fresh and the healthy air in.

Product Details


Typical applications are the controlled ventilation of larger rooms such as classrooms, meeting rooms, child-care centres, restaurants and event rooms. Thanks to the integrated filter and heat recovery, the automatic room ventilation improves the air quality in the room and lowers the proportion of CO2, aerosols, spores and dirt. At the same time, the permanent air exchange reduces the pollution of the room air with odours, bacteria and viruses.

Comfort features

Operating modes, programs and parameters can be set easily and intuitively with the control unit. The devices are easy to maintain and designed for quick and easy service. An additional sensor (accessory) measures the CO2 concentration of the room air and regulates the air output of the device fully automatically until the CO2 value falls below the set value again.

The device can be switched to basic ventilation or a higher air level via a motion sensor (accessory). The temperature-controlled bypass enables the heat recovery to be bypassed automatically. The devices are all equipped with an electrical preheater and can also be used at low outside temperatures with balanced supply, and exhaust air volume flows. The systems are equipped with motorized outside and exhaust air flaps to prevent uncontrolled airflow during standstill. In the event of a fire or loss of voltage, the spring-loaded outside and exhaust air flaps close the airways and thus help to minimise the spread of fire and smoke gas in the building. In larger buildings, up to 20 devices can be connected to one another and controlled using just one control unit. The devices are connected to a higher-level building control system using BacNet, Modbus and LON interfaces (accessories).


This device is designed for ceiling mounting and can be integrated into a suspended ceiling. It can be installed at different points on the ceiling. The nozzle for the supply airline is located on the front of the device. The exhaust air is routed via the exhaust air nozzle on the narrow right-hand side.


Energy-saving EC fans, in conjunction with the control and other sensors, enable efficient operation.

Technical Data

Product VRL-C 300 D Premium VRL-C 870 D Premium
Heat recovery Up to 92 %
Power consumption (fan max.) 137 W 329 W
Rated voltage 230 V
Air volume flow (m3/h) 100-300 300-870
Filter class extract air ePM10 = 50% (M5)
Filter class supply air ePM1 ≥ 50% (F7)
Air duct connection 200 mm 315 mm
Min. ceiling clearance 20 mm 20 mm
Height 407 mm 507 mm
Width 585 mm 902 mm
Length 1202 mm 1688 mm
Weight 100 kg 140 kg


File Category Type Download
VRL-C D DatasheetData SheetPDF
751.55 kB
VRL-C Installation GuideOperation and Installation GuidePDF
4.85 MB
VRL-C Operation GuideOperation and Installation GuidePDF
2.38 MB
Heat Recovery Ventilation WarrantyWarrantyPDF
176.06 kB
VRL-C 300 D Dimension DrawingTechnical DrawingPNG
292.21 kB
VRL-C 870 D Dimension DrawingTechnical DrawingPNG
296.80 kB
VRL-C 300 D 2D CAD DFX fileCAD DataDXF
515.28 kB
15.64 MB
739.91 kB
2.84 MB
VRL-C Commissioning ChecklistCommissioningPDF
863.58 kB


What is a heat recovery ventilation system?

Heat recovery ventilation (HRV), also known as mechanical ventilation, works by exchanging stale indoor air with fresh outdoor air while also recovering heat from the outgoing air. HRV systems include fine filtration to capture even the tiniest particles, including pollen and bacteria, ensuring that the air we breathe is clean and healthy.

What are the benefits of a heat recovery ventilation system?

One of the main benefits of a heat recovery ventilation system is that it provides continuous air exchange, which is essential for maintaining good indoor air quality. It removes pollutants and allergens from the air and can help to reduce heating and cooling costs.

How is a heat recovery ventilation system different from a portable air purifier?

Portable air purifiers can be effective at improving the air quality in a single room or small space, but they do not provide the same benefits as a heat recovery ventilation system. Portable air purifiers typically do not exchange air from outside, meaning that while the air quality in the room can be improved, the air itself is not exchanged with fresh outdoor air. This means that pollutants and other particulates can still build up over time, leading to poor indoor air quality.

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