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Aerodynamically optimized box for AFL Constant Flow fans with minimal pressure loss, low energy consumption and a height of only 225 mm.
Aerodynamically optimized insulated casing for AFL Constant Flow fan installation.
AIRBOX SLIM 250 is not an ordinary fan enclosure. It is a sophisticated mounting and insulating box that has been developed, tested and optimized to achieve the lowest possible power consumption while maintaining high airflow.
The product is designed for the installation of a compatible AFL Constant Flow radial fan. The fan has integrated control electronics and its own regulation system, which automatically adjusts its performance to maintain the required air volume flow.
Therefore, to ensure the Constant Flow function, it is not necessary to install external pressure sensors, pressure transmitters, pressure gauges or a separate pressure difference measurement system.
The fan, electrical connection and higher-level control are not part of the AIRBOX casing itself.
Just install a compatible AFL Constant Flow fan, connect the ducts and 0-10 V control. The AIRBOX is ready to create a professional ventilation unit in minutes.
AIRBOX SLIM 250 is supplied without a fan. Photos show an example of AFL Constant Flow fan installation.
| Low consumption | The casing was developed and tested to ensure the AFL Constant Flow fan operates with the lowest possible power consumption. |
| Height only 225 mm | The low-profile design is ideal for installation in suspended ceilings, technical rooms and places with limited building height. |
| Simple fan installation | The fan is installed inside the casing through a service door. There is no need to make your own brackets or an improvised acoustic cover. |
| Integrated Constant Flow control | The fan contains its own control electronics and automatically maintains the set flow without the need for external pressure sensors or gauges. |
| Insulation against condensation and noise | The internal synthetic rubber insulation helps reduce condensation while contributing to acoustic attenuation. |
| Solid PP construction | The AIRBOX is made of polypropylene, which does not corrode, is moisture-resistant and allows for long-term stable operation. |
During the development of AIRBOX SLIM 250, we tested various lengths, widths, depths and internal shapes of the box. We tried rounded corners inside, a dome-shaped cover and tilting the fan inside the casing.
However, measurement results showed that these solutions led to higher energy consumption. The best result was achieved precisely with the AIRBOX SLIM 250 design with spigots placed diagonally in a cross.
At approximately the same airflow of approx. 160 m³/h, a consumption of approx. 16 W was measured for the variant with spigots on the same axis. For the final version of AIRBOX SLIM 250, the consumption was only 11.2 W.
In a low-profile box, a direct arrangement of the inlet and outlet on the same axis would cause less favorable airflow inside the casing. The air stream would concentrate in one part of the space and the fan would operate under a higher load.
Therefore, in the AIRBOX SLIM 250, the spigots are placed diagonally in a cross. The air is better distributed inside the box, the flow is smoother and the AFL Constant Flow fan does not need to unnecessarily increase performance to overcome pressure losses.
The result is significantly lower electrical power consumption while maintaining high airflow.
| Volume flow | Consumption |
|---|---|
| 250 m³/h | 34 W |
| 182 m³/h | 12.4 W |
| 128 m³/h | 6.3 W |
| 82 m³/h | 3.4 W |
Measurement conditions:
A dimensional drawing of the AIRBOX SLIM 250 is available for dimension checking and installation design.
The drawing contains basic external dimensions, position of connection spigots and mounting elements.
| External height | 225 mm |
| External width | 342 mm |
| External length | 372 mm |
| Casing material | polypropylene PP |
| Internal insulation | synthetic rubber, thickness 10 mm |
| Mounting brackets | 4 brackets with Ø 12 mm holes |
| Optional connection diameters | Ø 125 mm, Ø 150 mm or Ø 160 mm |
The 10 mm thick synthetic rubber internal insulation reduces the risk of condensation on the casing surface while helping to dampen fan noise.
AIRBOX SLIM 250 is therefore also suitable for installation in residential buildings, technical rooms or suspended ceilings.
AIRBOX SLIM 250, like our RECUBOX® units, is made of high-quality polypropylene.
The connection spigots are equipped with double-lip seals for a firm and tight connection of the ventilation ducts.
Service access to the fan is via a door.
AIRBOX SLIM 250 is designed for the fastest possible installation into the ventilation system.
The casing is equipped with 4 mounting brackets with 12 mm diameter holes, which allow for simple and safe attachment to the ceiling, wall or supporting structure.
Thanks to the service door, the fan is easily accessible for installation, inspection and possible replacement.
There are three spigot diameters to choose from:
The greatest advantage of AFL Constant Flow fans is the ability to automatically maintain the set air volume flow even with changes in pressure losses in the ventilation system.
The fans have their own built-in control electronics and integrated regulation system. The fan electronics continuously evaluate its operating status and automatically adjust the speed to maintain the required air volume flow.
Therefore, for the Constant Flow function itself, it is not necessary to install external pressure sensors, pressure transmitters, pressure gauges or a separate pressure difference measurement system.
The required fan performance is set via a 0-10 V control signal. The fan then automatically responds to, for example:
If you connect two AFL Constant Flow fans to the same 0-10 V control signal and connect them to our RECUBOX® units, you get a simple basis for a modern balanced heat recovery system with very low electrical power consumption.
Such a solution is ideal for RECUBOX® modular heat recovery sets, smart homes, Loxone, Home Assistant and other building management systems.
We provide an above-standard 12-year warranty on the AIRBOX casing.
AIRBOX is made of high-quality polypropylene and joined using hot gas welding technology. The result is homogeneous, strong and long-term stable joints with no risk of corrosion.
Unlike sheet metal structures, there is no risk of corrosion, and unlike glued structures, the joints do not age due to moisture or temperature changes.
Thanks to its simple design with no moving parts, the AIRBOX is designed for long-term and trouble-free operation. We therefore provide a 12-year warranty on the tightness and mechanical integrity of the polypropylene casing.
AIRBOX SLIM 250 is a mounting and insulating casing for the installation of a compatible AFL Constant Flow fan.
The AIRBOX itself does not contain a fan, motor, electrical components or control electronics. It is a passive mechanical element designed for integration into a ventilation system.
The selection of the fan, its mounting, electrical connection and commissioning of the resulting assembly are carried out by the customer or a professional installation company.
RECUBOX® AIRBOX SLIM 250 is designed as a mounting and insulating casing for the installation of a compatible AFL Constant Flow fan. The fan itself, electrical connection and higher-level control are not part of the AIRBOX casing.
Read verified reviews from those who have purchased from us.
Highly efficient EC fan AFL CONSTANT FLOW , designed for installation in the RECUBOX® 250 VENT-READY unit.Thanks to intelligent regulation, it maintains a constant flow rate of 250 m³/h...
Aerodynamically optimized box for AFL Constant Flow fans with minimal pressure loss, low energy consumption and a height of only 225 mm.
