RadonTec | AlphaFreshbox 25 with humidity control

Item number: 50-003

548.32 £

including 19% VAT. , no shipping costs


Shipping time: 2 - 3 workdays


AlphaFreshbox 25 with humidity control

The AlphaFreshbox 25 with humidity control with heat recovery can automatically regulate the air supply according to the current temperature parameter. Increase not only the energy efficiency in the long term with this ventilation unit, also ensure the protection of your building fabric.  The AlphaFreshbox 25 with humidity control is also ideal for preventing or combating mold. In addition, the fan convinces with a timer function and an automated protection against frost.

If the radon activity concentration in cellars and living rooms is low, the BMU recommends regular mechanical cross-ventilation (window ventilation) of the rooms. Radon-contaminated air is quickly transported outdoors in this way.

If radon levels are elevated, manual ventilation can no longer sufficiently reduce the radon concentration. Here it makes sense to find a technical solution. Automated ventilation ensures that there is a sufficiently high air exchange and thus the radon concentration can be permanently lowered. Since radon usually enters the building via the basement rooms and spreads to the higher floors via stairwells, cables and pipe connections, reducing the radon concentration in the basement helps to significantly reduce the total radon load in the building.

The AlphaFreshbox 25 sensor-controlled ventilation system with humidity sensor monitors humidity as well as temperature. Climate-controlled ventilation systems with heat recovery and dew point control also prevent moisture from entering the basement, are easy on the wallet during the heating season and ensure a pleasant feel-good climate in living spaces.


Many advantages at a glance

  • Integrated humidity Control: Different ventilation modes
  • Integrated timer: regular change between basic and intensive ventilation
  • Sensor-controlled frost protection: automated operation
  • External USB connection: data transfer even when the housing door is closed
  • Free Windows software: display of measured live values
  • Air opening on the room side: room air connection possible
  • 12 volt DC motors with winglet technology: universal operation for all rooms
  • Remote control by external switches, grids and relays (software required)
  • Application for DIBt approval has been submitted


Perfectly fitting accessories for the AlphaFreshbox 25 with humidity control

All parts for the AlphaFreshbox 25 with humidity control can be found in the accessories section:

With the Wifi Module, in addition to configuring the AlphaFreshbox 25 with humidity control, you can also read out live data and display it via mobile devices.

The Ventilation Mushroom protects the pipe of your fresh air supply from rain and dirt.

The Flue Gas Thermostat enables automated alternating operation with a room air dependent fireplace.

The Pollen Filter protect allergy sufferers during the pollen season and are available as a pack of 10.

The Activated Carbon Filter clean the ambient air from odors and exhaust gases before they enter the building.

The Standard Filter should be replaced regularly to keep the AlphaFreshbox 25 with humidity control fully functional.

The 12 Volt In-Wall Power Supply invisibly supplies power to the ventilation unit from the rear panel.

If you order a version of the AlphaFreshbox 25 with humidity control at the same time, we will install the power supply unit before delivery. For this purpose, please order this variant of the 12 Volt In-Wall Power Supply (build-in).

The Heat Exchanger fits all variants of the AlphaFreshbox 25 with humidity Control.


Three operating modes of the humidity sensor

Cellar mode for maximum dehumidification

Especially in summer, incorrect ventilation can transport moisture into the basement, where it condenses due to the temperature difference. Without predefined basic ventilation, the ventilation system decides based on a dew point comparison whether intensive ventilation is appropriate at the moment. In winter, the unit works with heat recovery to prevent the basement rooms from cooling down.

Comfort mode for living rooms

Define the desired humidity content in the room air (e.g. 8.5 g/m³ for 50% relative humidity at 20°C room temperature) and the ventilation system provides a comfortable living climate fully automatically.

This function can be controlled by the integrated timer to minimize airflow noise during the night.

Cross ventilation without heat recovery in summer

In this mode, two ventilation units can be combined into a cross-ventilation group. If the room temperature exceeds a defined value while the outdoor temperature is lower, the cooler outdoor air is let in directly and the warm indoor air is exhausted, bypassing the heat recovery.

This mode can be combined with the comfort mode.

If you only use one AlphaFreshbox 25 with humidity control, define it as a supply air unit. Leaks in the building envelope ensure that the warm air is let out.


Technical data

Dimensions base body (HxWxD)40 x 30 x 10,5 cm
Dimensions front door (HxWxD)44,5 x 32 x 1 cm
Heat recoveryup to 90%
Ventilation pipe outside Diameter50 mm
Diameter outer Panels80 mm
Power regulation10 levels
Air flow rate5 - 20 m³ / h
Sound pressure level22 - 38 dBA
Standby< 0,5 watt
Power consumption (incl. frost protection)  1,5 to 6 watt


Scope of delivery

  • 1x AlphaFreshbox 25 with humidity control
  • 2 x humidity/temperature sensors already installed
  • 1 x 12 Volt power supply unit
  • 2 x plastic tubes diameter 50 mm, length 500 mm
  • 4 x foam rings (with core)
  • 2 x outer panels (with / without drip lip)
  • 4 x dowels + screws
  • 2 x G3 dust filter (standard)
  • 1 x CR2032 lithium battery
  • 1 x installation and operating instructions
  • 1 x drilling template
  • 1 x USB cable


The following accessories are still required for installation

  • A box of mounting foam to fix the pipes in the wall (for common stone or brick walls). Alternatively, e.g. in the case of timber frame construction, appropriate sealing material for the penetration of the vapour barrier.
  • Joint silicone or PU sealing compound for the transitions from the unit to the pipe and from the pipe to the outer panel


Software Download

Free download of the Windows software for control and evaluation of the AlphaFreshbox 25 with humidity Control.


RadonTec | AlphaFreshbox 25 Manual DE

RadonTec | AlphaFreshbox 25 manual EN

RadonTec | AlphaFreshbox 25 with humidity control datasheet DE

RadonTec | AlphaFreshbox 25 with humidity sensor Manual EN

RadonTec | AlphaFreshbox 25 drilling template

RadonTec | AlphaFreshbox 25 Software Manual EN


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