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If there is a lot of noise from the diffusers in a new apartment, it is likely that the ventilation system has not been properly balanced. Ask the company that installed or supplied the system to check and, if necessary, adjust the balancing. Correct balancing is essential to ensure proper airflow, low noise levels, and good comfort in the home.

Yes, you can use supply and extract air valves other than those included in Flexit’s product range. However, please note that our design drawings and settings are adapted to Flexit valves. If other valves are used, the airflow rates must be measured and the ventilation system must be rebalanced on site to ensure correct operation and proper air distribution.

Yes, it is technically possible to achieve cooler supply air in the bedroom than in the living room by installing a cooling coil on the supply air ducts. However, this is often a costly solution. In most cases, it is more cost-effective to invest in other measures, such as external solar shading, improved window shading, or reducing heat gains in the room. Cooling via the ventilation system should generally be considered a supplement to such measures, rather than a primary solution for room cooling.

Dust around vents is a well-known and common phenomenon referred to in technical terms as dust induction. The dust deposits originate from the dust present in the room air, not from the supply air delivered by the ventilation system. When the supply air meets the indoor air, differences in air velocity and temperature can cause dust particles in the room air to become statically charged. This makes the dust more likely to adhere to surfaces near the vent.The extent of dust induction is influenced by factors such as temperature differences between the supply air and ceilings or walls, as well as the amount of dust in the indoor air. Conditions such as tobacco smoke, the use of candles, and generally high dust levels indoors can intensify the problem. Smaller temperature differences and reduced dust levels in the indoor air can help reduce dust deposits to some extent.

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.