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Yes, ducts located in cold zones must be insulated. This can be done either by using insulation sleeves or by covering the ducts with a minimum of 100 mm of blown insulation. If the space where the ducts are installed maintains a constant temperature above 15°C, it is normally not necessary to insulate supply and extract air ducts. However, outdoor air intake and exhaust air ducts must always be insulated along their entire length, regardless of temperature conditions, to prevent condensation and heat loss.

Here’s how to find your model: Open the front cover of the ventilation unit. Locate the label inside the unit, usually placed on one of the side walls. Note the model name and serial number, for example Flexit UNI 4 or EcoNordic WH4. Search for your model name to find the correct filter.

For studio apartments, Flexit often recommends kitchen ventilation units. These are balanced ventilation units designed to be installed in the kitchen cabinet above the cooker and include integrated kitchen extract. This solution provides both effective ventilation of the apartment and kitchen extraction in one single unit and is particularly well suited where space is limited.

No, not all bathroom fans are suitable for ceiling installation. Flexit recommends ceiling installation only for bathroom fans designed for Ø125 mm ducting. These models are engineered to ensure correct airflow, safe installation and stable operation when mounted in the ceiling. Other models are designed for wall installation and must not be installed in the ceiling.

Yes, an older Flexit central vacuum unit can easily be replaced with a model from the CVR series. CVR central vacuum units are designed to be well suited as replacements for older Flexit units, making the replacement simple and limited in scope.

Yes, it is possible, but it depends on the type of humidity-controlled fan you have. Humidity-controlled fans with a timer, often referred to as TH models, can be connected to an external on/off switch between the L and LT terminals, as described in the user manual. When the switch is on, the fan will run continuously. When the switch is off, the fan will only activate automatically at high humidity levels via the humidity sensor. This provides flexibility between manual and demand-controlled ventilation. It is important to note that humidity-controlled fans with timers are designed for demand-controlled operation, not for continuous long-term use. If continuous ventilation is required, we recommend using a fan designed for this purpose, such as Flexit Pro7 or Flexit Vario. These models offer lower energy consumption, lower noise levels, and are suitable for continuous operation.

No, Nordic units cannot be installed outdoors. Flexit residential units are designed for indoor installation and are not intended for outdoor environments with cold temperatures, moisture, and weather exposure. For proper operation and long service life, the unit must be installed indoors in accordance with the installation manual.

Yes, Flexit units can be connected to smart home systems. The unit can be controlled via digital inputs, allowing external signals from the smart home system to manage functions such as changing operating modes or activating boost ventilation. For more advanced integration, the unit can also be controlled and monitored using Modbus communication, either Modbus RTU or Modbus TCP, depending on the unit model. If you are an end user and need assistance with setup or integration, we recommend contacting an authorised service partner or the retailer where the product was purchased.

Yes, Flexit can act as the responsible designer for ventilation systems in project class 1 and 2. This applies to projects where the scope and complexity fall within these project classes and where Flexit’s delivery and professional area of responsibility are clearly defined in the project.

Yes, you can open the window and ventilate the bedroom. The ventilation system is designed for normal operation, but it is completely unproblematic to ventilate extra when needed, for example for rapid air exchange or personal comfort.