KST-20 Vento with radon ventilation

 Radon ventilation with climate control KST-20 Vento/RN

Climate control KST-20 VENTO/RN

Automatic, controlled ventilation and dehumidification and cooling of rooms with the aH-Controlled technology* and RN-Protected label**

* aH-Controlled: Dehumidification on the basis of the absolute humidity

Further information on this topic can be obtained here: aH-Controlled technology

How aH-Chontrolled works

** RN-Protected: Ventilation on the basis of the radon concentration and the absolute humidity

Further information on this topic can be obtained here: Coming soon

Rn-Protected logo

Product description

The KST-20 Vento/RN is a climate control with aH-Controlled technology and RN-Protected label for ventilation and dehumidification for any private, commercial and industrial rooms. With its three operating modes (ventilation, dehumidification and radon measurement), the KST-20 Vento can be used flexibly in almost any kind of living, working and industrial environment.

Product features

Product features

  • Power supply: 230 V AC
  • Protection class: IP 65
  • Dimensions (LxWxH): 160 x 90 x 50 mm
  • Housing: High-quality ASA + PC (UL 94 V-0) for heavy duty, flame-resistant and self-extinguishing


The new, compact climate control KST-20 Vento/RN, for automatic and controlled dehumidification and ventilation is an advanced control unit for ventilation units.

Intelligent radon ventilation

Radon is a colour- and odourless gas which can accumulate in poorly ventilated rooms. The risk of health problems caused by radioactivity can be significantly reduced by using the KST-20 Vento/RN. It monitors the radon concentration indoors permanently and user-independently. The limit values can be set according to the applicable standards for living and working environments. This ensures that the rooms can be used under safe and healthy conditions.

Dehumidification on the basis of the absolute humidity

In dehumidification mode, the climate control KST-20 Vento/RN is designed to prevent mould and mildew, to preserve buildings and to maintain a comfortable feel-good climate. In this mode, moisture is removed from the room in a controlled and reliable manner and an optimum temperature and humidity ratio in relation to the absolute humidity can automatically be achieved.

Radon ventilation close-up view of display and operating keys

The basic principle of ZILA climate controls is to compare the water vapour content of the indoor and outdoor air. The water vapour content is defined by the absolute humidity (=aH) and is a measure of the "actual" humidity in the air. Comparing the absolute humidity of the indoor and outdoor climate ensures that moist air is removed from rooms and only drier outdoor air is introduced. "aH Controlled" means that suitable times for ventilation are automatically determined by the ventilation and dehumidification control, considering the climatic conditions inside and outside a building. At the same time, the devices can control the most common fans with and without heat recovery, as well as motor-driven window openers, fully automatically. This technology not only maintains a healthy building structure and a comfortable indoor climate, but is also very energy-efficient, as ventilation is only carried out if necessary and an air exchange makes sense.

Comfort functions

In addition to the automatic operating modes for ventilation and dehumidification, the KST-20 Vento/RN also has other comfort functions. With the integrated timer, pause and active times for ventilation units can be set down to the minute. A ventilation process can be started manually at any time using the button on the control unit housing. The "frost protection function" prevents the monitored room from cooling down too much, while a "dry protection function" prevents the room from rising, so that a healthy level for both people and the building can be maintained.

Recording the measured values on the display

Various configurations and settings can be made easily via the illuminated display and the operating keys.

Technical specifications

Technical specifications

  • Measuring range humidity: 0 ... 100 % rH
  • Measuring accuracy humidity: ± 2 %
  • Measuring range temperature: -40 ... + 80 °C
  • Measuring accuracy temperature: ± 0.2 °C
  • Signal output: I2C
  • Measuring range radon: 0…1200 Bq/m³
  • Adjustable limits: 0…1000 Bq/m³


  • Separate connections for supply and exhaust air elements up to a maximum of 500 W
  • Alternatively, the following devices can be connected:
    • One-step fans
    • Two-step fans
    • Speed-controlled fans (0…10 V DC)
    • 230V motorised window openers
    • 12V ventilation flaps

Operating conditions

  • Temperature: 0…50 °C
  • Relative humidity: 85 % non-condensing
  • EMC / ESD: EN50082-1 / 2


  • Dehumidification of rooms and buildings, such as cellars, archives, museums, churches
  • Ventilation when the radon limit is exceeded
  • Ventilation of meeting and classrooms, sports halls and fitness studios


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Dehumidification technology aH-Controlled briefly explained

Needs-based and user-independent cellar dehumidification with the KST-20 climate control

Energy-efficient room cooling with the KST-20 Vento

Prices and availability

For an individual offer for our climate control KST-20 Vento/RN, please contact us by phone at
+49 (0) 3681 86-7300 , by email under This email address is being protected from spambots. You need JavaScript enabled to view it. or by using our contact form.
Our experienced sales team is looking forward to your enquiry!

Blog posts about the KST-20 Vento/RN

Radon ventilation with our KST-20 Vento/RN

Radon ventilation with our KST-20 Vento/RN

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Radon inside the house, in the cellar or basement

Radon inside the house, in the cellar or basement

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Radon: Health risks and limit values

Radon: Health risks and limit values

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Blog series about radon

Blog series about radon

More details

Quotation, price information and ordering

Many of our products can be adapted to their fields of application and use individually. Besides the individual factory-set parameters, such as the different measuring ranges, the surrounding media and electrical connections and accessories are also important aspects for the offer.
Therefore, let us advise you professionally and without any obligation!
Our experienced sales staff will be pleased to prepare a suitable offer for you quickly.

Your contact options

Business times:
Monday - Friday 8:00 - 17:00 (CET)


Phone: +49-6251-8462-0

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