Enthalpy RECUBOX® OPEN ERV 03/100 - 140 m³/h (cased ERV exchanger, heat recovery box, ERV unit)

Enthalpy RECUBOX® OPEN ERV 03/100 – compact heat recovery box for low suspended ceilings

The enthalpy RECUBOX® OPEN ERV 03/100 is the smallest enthalpy RECUBOX® with a service door and integrated M5 class filters. It is a compact, extremely durable, and hygienically clean cased heat recovery exchanger designed for modern modular air heat recovery.

Unlike a standard heat recovery exchanger, the enthalpy variant can transfer not only heat but also a portion of the moisture from the exhaust air back into the supplied fresh air. The result is a more comfortable indoor environment, especially during the winter season when indoor air is often too dry.

The OPEN version is designed for easy service access, simple removal of the exchanger, and the possibility of regular inspection, cleaning, and replacement of the filter fabric.

Thanks to its exceptionally small dimensions of 441 × 441 × 165 mm, it is the ideal solution for low suspended ceilings, small apartments, flats, tiny house projects, toilets, sanitary facilities, technical rooms with limited space, and decentralized HVAC systems.

The height of only 165 mm allows installation even where classic heat recovery units simply cannot be used.

Custom manufacturing in the Czech Republic. We manufacture RECUBOXY® completely in the Czech Republic according to the exact requirements of our customers. We use high-quality polypropylene materials from SIMONA AG and professional hot gas welding technology on Leister AG equipment.

Each RECUBOX® is created as an honestly crafted technical product – with an emphasis on precision, tightness, long service life, and the ability to adapt to a specific installation.

Why choose enthalpy heat recovery?

An enthalpy exchanger does not create moisture, but it can return a portion of the moisture from the exhaust air back into the interior. This helps mitigate excessive drying of the indoor air during the heating season.

In normal operation, indoor humidity will not increase immediately. The enthalpy exchanger works gradually – moisture is returned continuously, and the final effect depends on the specific house, the ventilation regime, the outdoor temperature, the humidity of the exhaust air, and the absorbency of building materials.

The practical result is a more pleasant indoor climate, less feeling of dry air, higher living comfort, and at the same time maintaining a hygienic air exchange.

Main advantages of the RECUBOX® OPEN HRV 03/100 unit

Tightness and service access

The tightness of the casing is crucial for efficient heat recovery. RECUBOX® is equipped with massive adjustable buckles that allow you to finely tune the pressure of the lid against the seal. As a result, the unit does not suck in false air and operates with the maximum possible efficiency.
In the uninsulated version of RECUBOX®, the sealing and attachment of the lid are handled using screws and blind rivet nuts instead of buckles.

A choice of three enthalpy exchangers

The enthalpy RECUBOX® OPEN ERV 03/100 can be equipped with three types of enthalpy counter-flow exchangers.

Each of the exchangers offers different technology, structural design, and price/performance ratio. Thanks to this, the RECUBOX® can be adapted to specific project requirements – from an economic solution to top-tier METALPIC technology.

The choice of the exchanger is made during the ordering process.

Thanks to their robust design, high quality, and hygienic safety, our RECUBOXY® are part of a number of projects at the ČVUT (Czech Technical University), including the unique S.A.W.E.R. system, which UCEEB is developing for obtaining drinking water from the air.

12-year warranty on casing tightness

We offer an above-standard 12-year warranty on the airtightness of the casing of RECUBOX® units.

The casing is made of high-quality polypropylene and joined using hot gas welding technology, which creates homogeneous, strong, and long-term stable joints without the risk of degradation.

Unlike designs using glued joints, sealing tapes, or combinations of different materials, the RECUBOX® maintains its airtightness and mechanical resistance even after many years of operation.

Insulation and double-skin design

Video presentation of RECUBOX®

Take a look at the philosophy and construction of the RECUBOX® system.

The video shows the basic principles of construction, modularity, hygiene, and service access.

Example of connection in a single-family home

Example of a RECUBOX® OPEN connection in a single-family home.

Click on the diagram to enlarge.

Connection with REX EC control and EC fans

Demonstration of wiring with EC fans and the RekupeX REX EC control.

RECUBOX® OPEN HRV 03/100 is designed for use with external duct fans.

Variants of connection spigot placement

The choice of variant is made during the ordering process.

Dimensions are given without insulation. In the case of the insulated version, it is necessary to take into account an increase in dimensions.

If it is necessary to adjust the dimensions, for example due to larger connection spigots or a specific installation requirement, we will inform you after ordering.

Recommended fans

RECUBOX® OPEN HRV 03/100 is intended for use with external duct fans.

For optimal performance, we recommend fans with similar parameters as:

• VENTS VK 100,
• VENTS VK 100 EC,
• VENTS VK 125,
• VENTS VK 125 EC.

The fans are not located inside the unit. The Enthalpy RECUBOX® OPEN HRV 03/100 is not a VENT-READY design.

System regulation and control

The regulation and control of the RECUBOX® can be handled in many ways depending on the type of fans used and the requirements of the specific installation.

A great advantage of the modular system is that you are not bound to one specific control. The control can be designed simply for undemanding applications, or as part of a smart home or advanced ventilation system.

100% BY-PASS

RECUBOX® can also be supplied in a variant with a 100% mechanical BY-PASS.

This system closes the passage of fresh air through the exchanger in an instant, and at the same time opens a bypass channel behind the exchanger.

The advantage is that even with an active BY-PASS, the air remains filtered by the same filter as during normal operation through the exchanger.

The integrated 100% BY-PASS is located behind the exchanger and creates a separate bypass channel for the supply of fresh air.

For versions with an integrated BY-PASS, it is therefore necessary to take into account an increase in the final dimensions of the RECUBOX®. The depth of the unit increases by approximately the dimension of the connecting flange, and depending on the specific configuration, the width of the unit may also increase.

The final dimension of the RECUBOX® with an integrated 100% BY-PASS always depends on the selected variant of the spigots, the size of the connecting flanges, the orientation of the unit, and the specific installation requirement.

The control of the BY-PASS is handled via a DN14 shaft, which is brought out of the RECUBOX® to its outer wall.

In the basic version, it is equipped with a manual control handle, which can be easily replaced with a servomotor. This is anchored with a screw into an installation plate fixed with four metric screws.

The BY-PASS in the RECUBOX® serves to allow the air in certain situations to bypass the heat recovery exchanger without transferring heat.

It is most often used in the summer: if it is cooler outside at night than inside the house, the heat recovery opens the BY-PASS and the cool outdoor air flows directly into the interior without being heated by the exhaust air. Thanks to this, natural night cooling of the building can occur, and with filtered air, which is important e.g. for allergy sufferers.

The second important use is the protection of the exchanger against freezing. At very low outdoor temperatures, the control system can temporarily open the BY-PASS, which defrosts the exchanger and prevents damage to it.

Simply put: The BY-PASS is a "bypass" of the heat recovery exchanger that allows intelligent control of when heat should be transferred and when not.

Thanks to the modular concept of the RECUBOX®, you can choose exactly the level of control your project needs – from simple on/off switching to fully integrated control in a smart home.