Install a window fan fan

The developments in recent years have been enormous when it comes to the thermal insulation properties of windows. But with these windows came the problem of improper ventilation. Window rebate ventilators provide a limited remedy here. In the following we explain to you whether it is worthwhile to retrofit a window rebate ventilator and what to consider when retrofitting.

Modern house building versus traditional house building

Modern windows are completely airtight and gas-tight. They are actually designed in such a way that the traditional, classic ventilation of buildings no longer works. Because until the new millennium, houses were built in such a way that they were deliberately leaky in the building envelope:

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  • open basement windows
  • leaky windows (due to the window installation in the reveal)
  • leaky doors (same principle)
  • Cold roof (it is ventilated from the inside through the roof)

Everyone still knows the open cellar windows, as well as the damp cellar. But also the windows, which were never really airtight in their connection to the reveal. According to today's guidelines, however, windows and doors are installed according to RAL in such a way that the windows are absolutely tight and also withstand so-called blower tests.

Energy-efficient houses require separate ventilation

For modern houses that are equipped with a watertight white basement tub and a warm roof, the windows even have to be like this. Because, contrary to the traditional construction method, additional ventilation is also integrated in energy-saving houses. In the meantime, it has been so refined that heat is even recovered.

Often problems with thermal insulation windows in conventional buildings

In addition, a completely wrong ventilation behavior of the people came with the tilting window. Under Tilt Windows you can read that it is wrong to tilt windows open for a long time. The heat that escapes is enormous and immediately hits the energy bill. The only way to counter this and save some energy costs is with window rebate ventilators.

Retrofitting a window rebate ventilator can help

These are inserted in the window rebate between the window sash and the window frame by simply removing a piece of the rubber seal. The window rebate ventilator has somewhat the same diameter as the rubber seal, but is air-permeable. The air opening is passively pressure controlled. So only air can escape or. get into the house when the pressure difference between inside and outside is appropriate.

You may not retrofit such fans in every house!

You are not allowed to retrofit such window rebate ventilators in low-energy houses, as this would destroy the entire energy-saving concept. However, you can use these chandeliers where old existing buildings were equipped with modern, high-density thermal insulation windows. A window rebate ventilator makes sense, especially if you are on the move a lot.

Retrofitting is worthwhile here

But possibly also if you have tenants in an apartment who do not know how to ventilate. However, if you have enough time to ventilate, you should always follow the manual ventilation according to the current advice, as we also describe it under "Tilt window " in the previous link.

Observe the manufacturer's installation instructions

When installing a window rebate ventilator, it is essential that you follow the manufacturer's installation instructions. Because the position of the fan is mandatory. For example, the fans must not be installed in the facing of windows.

Tips & Tricks You can find more information on insulating windows in numerous guides and articles in the house journal. It is important to bear in mind that due to the enormous advances in insulation technology and windows, there are many aspects that need to be taken into account so that modern technology and existing and old buildings fit together.

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