We offer a wide range of enthalpy heat exchangers for most heat recovery ventilation units.
If you can't find the right model, contact us – we'll be happy to help!
RECUBOX® OPEN HRV 03/100 is the smallest opening RECUBOX® for a flow rate of up to 140 m³/h . With a height of only 165 mm , it is ideal for low ceilings and small spaces. It offers efficiency of up to 95% , custom-made in the Czech Republic, variable necks and a 12-year warranty on the tightness of the casing .
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, 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.
Main parameters:
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.
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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.
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.
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Easy removal of the exchanger The exchanger can be easily slid out of the RECUBOX® OPEN unit through the service door. This makes maintenance significantly more comfortable than with closed heat recovery boxes. |
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Integrated M5 filters In its basic design, the unit is equipped with filter fabrics of the M5 class. The filters protect the exchanger from clogging and contribute to a healthy climate in your home. They are easily accessible through the service door. |
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Maximum hygiene The OPEN service design allows you to remove the exchanger, check the internal space of the unit, and perform cleaning as needed. This is essential for long-term hygienic heat recovery operation. |
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Mechanical sealing without glue The exchanger is mechanically sealed in the unit using a seal in a groove. We do not use adhesive tapes or glues that could degrade over time. |
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Without screws, rivets, and glues The RECUBOX® casing is made of polypropylene and joined using hot gas welding technology. The result is strong, homogeneous, and long-term tight joints. |
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Condensate drain 1/2" The condensate drain is handled by a 1/2" threaded fitting. In the C02 variant, the condensate drain is routed through the service door. |
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Variability of connection spigots RECUBOX® OPEN can be ordered in various configurations for the placement of connection spigots according to the specific installation. |
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Easy installation The unit is ready for mounting in a technical space and connection to external duct fans, control systems, and other elements of the HVAC system. |
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.
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.
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AIRWOODS AXT-LB 366 196 366-H105-2.5 An enthalpy counter-flow exchanger with a very good price/performance ratio. A suitable solution for projects where an enthalpy function, compact design, and economic affordability are required.
A practical choice for affordable enthalpy heat recovery. |
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ZERN ENGINEERING EC-EX 366-100 An enthalpy exchanger from the manufacturer ZERN ENGINEERING with a robust construction and proven technology for heat and moisture recovery.
A suitable solution for customers looking for a solid and long-term stable enthalpy variant. |
Datasheet |
RECUTECH RFK+16-100-F-28 – METALPIC enthalpy A top-class enthalpy exchanger from the Czech manufacturer RECUTECH with modern METALPIC technology. This is the most advanced variant for customers who want the maximum technological level, low pressure drops, and long-term durability.
The recommended choice for the most demanding applications where the emphasis is on efficiency, comfort, and build quality. |
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.
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.
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The RECUBOX® can be ordered in several insulation variants:
In the double-skin version, the insulation is hermetically sealed between two casings. In addition to the insulator itself, another robust polypropylene casing is created. The result is a very durable construction, stable in the long term, and suitable for even the more demanding technical spaces. |
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 a RECUBOX® OPEN connection in a single-family home.
Click on the diagram to enlarge.
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.
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.
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A01 Exchanger on a wide tray, 4 spigots to the sides Dimensions: 441 (A) × 441 (B) × 165 (C) mm – width × height × depth |
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B01 Exchanger on a narrow tray, 4 spigots to the sides Dimensions: 441 (A) × 441 (B) × 165 (C) mm – height × width × depth |
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A02 Exchanger on a wide tray, 2 spigots up, 2 spigots to the sides Dimensions: 441 (A) × 441 (B) × 165 (C) mm – width × height × depth |
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B02 Exchanger on a narrow tray, 2 spigots up, 2 spigots to the sides Dimensions: 441 (A) × 441 (B) × 165 (C) mm – height × width × depth |
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C01 Exchanger on the front face, 4 spigots upwards Dimensions: 441 (A) × 265 (B) × 441 (C) mm – width × depth × height |
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C02 Exchanger on the front face, 4 spigots to the sides at the same height Dimensions: 441 (A) × 165 (B) × 441 (C) mm – width × depth × height This variant is suitable for a suspended ceiling where the exchanger and filters slide out of the RECUBOX® towards the floor. The condensate drain is located on the door and must be disconnected before service interventions. |
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Do not hesitate to contact us with your specific requirement. We manufacture RECUBOXY® to order and in many cases we can adjust the orientation or location of the spigots according to the specific installation. |
RECUBOX® OPEN HRV 03/100 is intended for use with external duct fans.
For optimal performance, we recommend fans with similar parameters as:
The fans are not located inside the unit. The Enthalpy RECUBOX® OPEN HRV 03/100 is not a VENT-READY design.
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Possibility to order AFL EC CONSTANT FLOW fans For the RECUBOX® OPEN HRV 03/100, it is also possible to supply a duct casing for mounting AFL EC CONSTANT FLOW fans to order. AFL EC CONSTANT FLOW fans for RECUBOX® A huge advantage of the CONSTANT FLOW technology is the ability of the fans to automatically respond to changes in pressure drops in the system and adjust the speed so that a stable air flow is maintained in the long term. In addition, the fans are very suitable for smart homes – thanks to the 0–10 V control, they can be easily connected to, for example, Loxone, Home Assistant, and other intelligent systems. |
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.
| AC fans |
Simple and economical control for undemanding applications. For AC fans, you can use, for example, control via a timer clock in the style of 0/1 – on / off. The operation of the fans can also be regulated using triac regulators. |
| EC fans |
Modern, economical, and very well controllable solution. If you use EC fans, their performance can be continuously controlled via a DC 0–10 V signal. For controlling EC fans, you can use, for example, our RekupeX REX EC controller: REX EC – controller for heat recovery sets with EC fans It is also possible to use another EC controller or a direct connection to a smart home, such as Loxone or Home Assistant. |
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.
Data sheet
Read verified reviews from those who have purchased from us.
Modern EC fan ...... Output 340 m3/h ..... Connection diameter 100 mm ..... 0 - 10 V control .....
Control of fans with EC motors .... 0 - 10 V
Connection diameter 100 mm Max. output 250 m3/h.
flush-mounted or box-mounted, 1.8A, 400W, 230V AC, IP 40
regulation for a system with EC fans, frost protection or BY-PASS control programming of ventilation intensity, monitoring filter replacement, quick ventilation - control from the toilet,
Highly efficient EC fan AFL CONSTANT FLOW , designed for installation in the RECUBOX® 520 VENT-READY unit.Thanks to intelligent regulation, it maintains a constant flow rate of 520 m³/h...
Highly efficient EC fan AFL CONSTANT FLOW , designed for installation in the RECUBOX® 360 VENT-READY unit.Thanks to intelligent regulation, it maintains a constant flow rate of 360 m³/h...
Compact insulated PP casing for installing the AFL EC Constant Flow 360 m³/h fan. Features 90° airflow, dimensions of just 320 × 245 × 300 mm, simple installation, service door, measured...
RECUBOX® OPEN HRV 03/100 is the smallest opening RECUBOX® for a flow rate of up to 140 m³/h . With a height of only 165 mm , it is ideal for low ceilings and small spaces. It offers efficiency of up to 95% , custom-made in the Czech Republic, variable necks and a 12-year warranty on the tightness of the casing .
