FFL-smart - How an intelligent window rebate vent automatically regulates the air flow

FFL-smart: How a smart window rebate vent automatically regulates the air flow

Modern building envelopes are extremely airtight these days – an advantage for thermal insulation, but a challenge for ventilation. This raises a key question, particularly in living spaces, offices or refurbished existing buildings: how can fresh air be reliably supplied to a room without wasting energy or causing discomfort to the occupants?
With the FFL-smart, we at Regel-air have developed an window rebate vent that tackles precisely this issue: it regulates the air flow automatically and in response to wind pressure – without any electricity or manual adjustment.

Why controlled ventilation is crucial today

In practice, we see the same challenges time and time again:

• manual ventilation takes place irregularly or not at all

• windows left permanently ajar cause high energy losses and structural damage

• mechanical ventilation systems are often too expensive or structurally impractical

Window rebate vents have therefore established themselves over the years as a simple and reliable solution. However, traditional models often operate with fixed air flow rates – regardless of whether it is calm outside or there is a strong wind.

What we mean by an ‘intelligent’ window rebate vent

With the ‘ FFL-smart’, we have deliberately chosen a different approach. Here, ‘intelligence’ does not mean electronics or sensors, but rather a mechanical, self-regulating adjustment of the air flow to the actual external conditions.

In concrete terms, this means:

• The air flow automatically adjusts to the prevailing wind pressure

• In strong winds, the air flow is reduced

• In light winds, the necessary air exchange is maintained

This creates a steady, controlled airflow that results in neither draughts nor unnecessary energy loss.

How the FFL-smart automatically regulates the air flow

The system works on the basis of a pressure-dependent control mechanism in the form of a flap, which operates entirely without electricity.

The principle:

• If the external wind pressure increases, the differential pressure at the vents rises

• An integrated control element reacts mechanically to this change

• The airflow is automatically adjusted

• The resulting air flow remains at a comfortable and practical level

The user does not need to make any adjustments, carry out any readjustments or change filters.

Benefits of automatic airflow adjustment in everyday life

Consistent indoor air quality

A steady air exchange helps to:

• the prevention of mould growth

• the removal of moisture

• the reduction of pollutants

Greater energy efficiency

As no excessive volumes of air flow in:

• energy costs can be reduced

• less energy is required to heat the flat

Noticeably greater comfort

• no draughts draughts when it’s windy

• no manual opening or closing

• No additional effort required to operate

FFL-smart compared to conventional window rebate vents

The difference in day-to-day operation is particularly evident in changing weather conditions.

Benefits of automatic airflow adjustment in everyday use

FFL-smart is particularly suitable for:

• Residential construction and refurbishment projects

• PVC windows

• Buildings with and without exhaust air systems

• energy-efficient new-builds

• No manual opening or closing

• Properties with high standards of user comfort

It is used wherever a low-maintenance, standard-compliant and cost-effective ventilation solution is required.

Developed for real-world use

When developing the FFL-smart, our focus was always on real-world applications: real buildings, real users and real weather conditions. That is why we deliberately opt for:

• purely mechanical, durable solutions

• discreet integration into the window system

• reliable operation over many years

This combination feature makes the FFL-smart a modern evolution of the classic window rebate ventilator.

Conclusion: Automatic regulation makes all the difference

The FFL-smart’demonstrates how window rebate vents have evolved technically. The automatic adjustment of the air flow ensures:

• consistent indoor air quality

• reduced energy losses

• a high level of comfort for users

This makes the intelligent window rebate vents a contemporary solution for modern construction and refurbishment – simple, reliable and effective in the long term.

Further information:

On the product page for the ‘ FFL-smart’ , you will find detailed technical specifications, installation instructions and possible applications.