REX EC V2 - heat recovery controller, recuboxes and heat...
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,
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!
The foundation for high-tech heat recovery. RECUBOX® HRV 360 VENT-READY TOP is prepared for easy installation of premium AFL EC fans with the CONSTANT FLOW system.
RECUBOX® HRV 360 VENT-READY TOP is a compact non-enthalpy heat recovery unit prepared for installation of AFL CONSTANT FLOW EC fans. The TOP design with all four connection spigots pointing upwards saves space and facilitates the connection of ductwork above the unit. RECUBOX® represents an exceptionally durable, hygienic, and versatile basis for modern balanced heat recovery ventilation in family houses, apartments, and smaller commercial buildings.
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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Every 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.
The casing is structurally optimized for installation of AFL EC CONSTANT FLOW fans, which represent an extraordinarily smart solution for modern heat recovery. Thanks to the built-in Constant Flow function, the fans automatically respond to changes in system resistance and help maintain a stable airflow, balanced pressure, low noise, and economical operation over the long term.
The unit is equipped with a counter-flow non-enthalpy heat recovery exchanger with a thermal efficiency of up to 90%. The exchanger transfers heat between the extract and supply air streams while keeping both airflows completely separated. It is designed with an emphasis on low pressure drops, which contributes to quiet, economical, and efficient operation.
Performance parameters of the system with AFL CONSTANT FLOW fans:
RECUBOX® HRV 360 VENT-READY TOP can be fitted with three types of non-enthalpy counter-flow heat exchangers.
The individual variants differ in lamella material, structural execution, and price. This allows RECUBOX® to be tailored to specific project requirements – from an all-aluminum exchanger by a Czech manufacturer to durable designs with HPS lamellas.
The choice of exchanger is made during the order process.
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| RECUTECH RSK+16-400-25 |
All-aluminum counter-flow exchanger by the Czech manufacturer RECUTECH A robust exchanger with aluminum lamellas and an aluminum casing. Offers high mechanical resistance, long service life, and very good thermal conductivity.
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| RECUTECH RSF+16-400-H-F-29 |
Counter-flow exchanger with HPS lamellas by the Czech manufacturer RECUTECH Lightweight, hygienic, and corrosion-resistant exchanger with plastic HPS lamellas. Suitable for standard residential and commercial applications where long-term stability and easy maintenance are emphasized.
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| ZERN ENGINEERING HU-EX6 366/400 |
Counter-flow exchanger with HPS lamellas and HPS casing Completely plastic execution by manufacturer ZERN ENGINEERING offers high resistance to corrosion and moisture. The exchanger is a practical and cost-effective choice for efficient non-enthalpy heat recovery.
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The casing is prepared so that fans can be fitted very quickly and without complex modifications. Installation of AFL CONSTANT FLOW fans is carried out by simply sliding them into the prepared opening and securing them.
All duct outlets and the condensate drain are designed symmetrically (mirrored), allowing you to choose the final orientation of the unit during actual installation. RECUBOX® can also be operated with external fans according to your own design.
Control of EC fans is very simple using a 0–10 V DC signal. The unit can be controlled, for example, via:
Product scope of delivery: RECUBOX® HRV 360 VENT-READY TOP is supplied with an integrated heat exchanger, but without fans and without a control unit. Fans and control unit can be purchased separately and easily installed by the user.
In its basic version, RECUBOX® is also prepared for sensors, cabling, and safe electrical installation. Thanks to thoughtful details, mounting sensors, routing cables, and connecting fans is quick, clear, and technically clean.
The unit thus facilitates not only the installation itself, but also future servicing, modifications, and system expansions.
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Drawing of position, quantity, and execution of cable glands. |
RECUBOX® HRV 360 VENT-READY TOP is also available in a variant with a 100% mechanical BY-PASS. This sophisticated system closes the fresh air passage through the exchanger in an instant, while simultaneously opening a large bypass channel behind the exchanger.
The advantage is that even when BY-PASS is active, the air remains filtered by the same filter as during normal operation through the exchanger.
Removable BY-PASS mechanism
The entire mechanism can be completely removed from RECUBOX® in a single pull, just like the other components. Servicing, inspection, and cleaning are therefore exceptionally easy.
The mechanism is structurally prepared for mounting any servomotor with a minimum torque of 5 Nm. The servomotor is attached to a prepared 10 mm thick plastic plate and locked against rotation with the enclosed metric screw. Compatibility with a 14 mm diameter shaft is required.
Casing tightness is essential for efficient heat recovery. RECUBOX® is equipped with massive adjustable latches that allow fine-tuning the pressure of the lid against the seal. As a result, the unit does not draw in false air and operates with the highest possible efficiency.
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 extracting drinking water from the air.
We provide an above-standard 12-year warranty on the airtightness of the RECUBOX® unit casing.
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 utilizing glued joints, sealing tapes, or combinations of different materials, RECUBOX® retains its airtightness and mechanical resistance even after many years of operation.
RECUBOX® HRV 360 VENT-READY TOP is not just a fan-ready cabinet. It is a well-thought-out basis for extraordinarily comfortable, stable, and technically advanced heat recovery. It is precisely when equipped with AFL EC CONSTANT FLOW fans that the true strength of the entire VENT-READY concept is fully revealed.

Main benefit of CONSTANT FLOW technology:
AFL fans automatically maintain a constant air volume flow even when pressure losses in the system change. This means the unit operates stably even as filters gradually become clogged, operating conditions change, or resistance in the ventilation ductwork fluctuates.
This is a huge advantage over conventional fans, where the system must be intricately fine-tuned and performance can drop or pressure balance can be lost with every change in resistance. With AFL CONSTANT FLOW fans, you gain much more stable operation, more reliable air exchange, and higher comfort without unnecessary setting adjustments.
| Constant Airflow | Fans automatically compensate for resistance changes in the system and maintain the set performance without constant re-adjustments. |
| Automatic Pressure Balance |
Balanced pressure operation is very simple in the VENT-READY system with AFL CONSTANT FLOW fans. Both fans can be connected to the same control signal from any suitable controller. If both fans receive the same control signal value, they automatically maintain the identical airflow volume flow. This applies even when each fan overcomes a different duct or filter resistance. |
| Lower Noise | At lower resistance, the fan automatically reduces its speed so the system can run quieter and more smoothly. |
| Lower Power Consumption | When high output is not required, the fan does not consume power unnecessarily. The result is a more economical operation. |
| Full Controllability | The Constant Flow feature works across the entire control range, allowing unit output to be easily adapted to current building needs. |
Practical result for the user:
When you choose RECUBOX® HRV 360 VENT-READY TOP and equip it with AFL EC CONSTANT FLOW fans, you get an extraordinarily smart combination: an indestructible, hygienic, and service-accessible RECUBOX® unit plus fans that automatically monitor a stable airflow. The result is modern heat recovery with high comfort, low noise, and without unnecessarily complex balancing.
See why AFL CONSTANT FLOW fans for RECUBOX® VENT-READY are so exceptional.
In the video, you will see the principle that allows fans to automatically respond to changes in system resistance and help maintain stable heat recovery performance in the long term.
VENT-READY truly makes sense with AFL CONSTANT FLOW. It is not just about mechanical compatibility, but a functional whole that delivers a more stable flow, quieter operation, lower consumption, and an easier path to professionally operating balanced heat recovery.
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Easy Exchanger Removal The exchanger can be quickly and easily pulled out of the RECUBOX® unit in a single motion. |
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Maximum Hygiene The non-enthalpy exchanger can be easily removed, thoroughly rinsed with water, and reinstalled. The interior of the unit remains accessible for regular cleaning. RECUTECH exchangers are certified with a hygiene certificate from ILH Berlin. |
| Mechanical Sealing Without Glues The exchanger is sealed with a gasket in a groove without using adhesives or sealing tapes. The gasket can be easily replaced if necessary. |
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| Without Screws, Rivets, and Glues RECUBOX® is manufactured from a single type of material using hot gas welding technology. The result is tight and long-term stable joints without aging degradation. |
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| Wide Range of Sizes The VENT-READY series is available in several performance variants, and larger custom designs for higher volume airflows can also be produced on request. |
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Compatibility with RECUTECH Exchangers and Other Types The units are designed for high-quality RECUTECH exchangers with EUROVENT certification and other compatible exchangers according to specific configuration. |
| Balanced Pressure Operation When using AFL CONSTANT FLOW fans, stable and pressure-balanced operation of the entire heat recovery system is very easily achieved. |
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| Option to Install Ionizer The unit can be supplemented, for example, with a MALAPA IN03 ionizer. |
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| Maximum Variability Placement of inlet and outlet spigots can be customized for specific installations in a wide variety of configurations. |
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| Mirrored Execution The unit can be connected in left or right orientation during installation. Condensate drain is handled by a 1/2" connection in two positions. |
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| Easy Installation The unit is ready for mounting via threaded rods and allows simple placement in the technical room. |
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| Large-Area Filters The unit allows the use of various filter media. In its basic configuration, it is fitted with a class M5 filter fleece. |
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BY-PASS A bypass duct module or an integrated 100% BY-PASS is available. |
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Technical drawing RECUBOX® HRV 360 VENT-READY TOP without BY-PASS Click image to enlarge. |
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Technical drawing RECUBOX® HRV 360 VENT-READY TOP with 100% BY-PASS Click image to enlarge. |
Connection example of RECUBOX® VENT-READY with REX EC control in a family house.
Click on diagram to enlarge.
The choice of variant takes place during the ordering process.
Front view of RECUBOX® with open doors.
The listed dimensions include 50 mm insulation and the second casing. Should dimensions change, for example due to larger spigots or another technical modification, we will inform you after ordering.
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RECUBOX® TOP – all 4 spigots pointing upwards Dimension: 843 (W) × 570 (H) × 690 (D) mm – width × height × depth Drawing shows classical and mirrored connection, which can be realized without rebuilding the unit. |
RECUBOX® HRV 360 VENT-READY TOP is also available in two variants with 100% BY-PASS.
Below you will find drawings of both variants including dimensions. Dimensions are given including 50mm insulation. Top view of RECUBOX®.
Prices are final including integrated exchanger, all costs, taxes, and fees.
Data sheet
Read verified reviews from those who have purchased from us.
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® 360 VENT-READY unit.Thanks to intelligent regulation, it maintains a constant flow rate of 360 m³/h...