Regel-air® window rebate vents

Regel-air® window rebate vents and ventilation systems:
Which vents is right for your needs?

Window rebate vents & ventilation systems for PVC windows

There are various Regel-air® ventilation modules for PVC windows: The window vents FFL-smart FFL, FFL-m, FFL-uni, FFL-quick, PLUS and FORTE.

Depending on the planned ventilation requirements, precisely controlled, medium and high air flow rates can be achieved. All Regel-air® ventilation systems require no cut-outs in the window frame for air ducting . As the ventilation modules are simply fitted into the window rebate, the façade remains visually unaltered. This is a very important consideration in energy-efficient refurbishments and modernisation projects involving listed buildings, to avoid ventilation issues. Our window rebate vents are maintenance-free, require no energy whatsoever and ensure effective passive ventilation – even in the context of forced ventilation. They are suitable both for factory installation and for the retrofitting to windows that have already been fitted windows. In short: our ventilation modules are the cost-effective solution for automatic air exchange, preventing mould damage caused by excessive humidity in the indoor air, and the efficient resolution of any existing ventilation problem. 
The certified Regel-air® vents are driving rain proof and can also be used in properties with higher sound insulation requirements, up to sound insulation class 4 . The windows’ burglary resistance remains unchanged.

• The Regel-air® ventilation system FFL consists of a pair of self-regulating window rebate vents made of PVC. Each vent module features automatic airflow control. The FFL fits into the window rebate of all standard PVC windows.The Regel-air® window rebate vent is installed concealed in the upper, non-fitting area of the window. When the window is closed, the vent is not visible from either the inside or the outside when the window is closed, but ensures sufficient air exchange to supply the room with fresh air and remove moisture via the stale air .
  
  The Regel-air® window rebate vent FFL act as differential-pressure-controlled fresh air inlets with a suitable control variable in accordance with DIN 1946-6. The ventilation system ensures reliable moisture-protection ventilation at all times. The Regel-air® overlap vent ÜL can be manually adjusted or closed as required.
  
  As wind pressure increases, the system’s ventilation flaps close automatically. This prevents draughts. The ventilation flaps open again automatically as soon as the wind pressure decreases.
  
  
• The Regel-air® ventilation system FFL-m is a vent concealed within the window rebate, which can be opened and closed via a barely noticeable control lever whilst the window is closed. The FFL-m is suitable for both horizontal and vertical installation. A basic ventilation is possible despite the vent is possible if the sash gasket is the manufacturer’s specifications to an extended length, thereby increasing the achievable air flow rates. The Regel-air® FFL-m enables controlled air exchange and reliable dehumidification without draughts. 
  
  
• The Regel-air® ventilation system PLUS is a combination of the self-regulating window rebate vents FFL with automatic air flow limitation and a manually and continuously adjustable overlap vent ÜL to increase the air flow rate.
  
  The required minimum air change rate can be easily achieved by using the Regel-air® vents.
  
  
• The Regel-air® FORTE ventilation system combines a pair of manually infinitely adjustable Regel-air® slide vents and a pair of Regel-air® FFL  with automatic airflow control. As an automatic ventilation system, the window rebate vents FFL ensure the necessary minimum air exchange at all times. The slide vent can be operated as required. With the Regel-air® FORTE system, over 20 m³/h of air can be moved per window sash without opening the window . Even when used in conjunction with extract ventilation systems, the Regel-air® FORTE ventilation system is ideally suited to high air flow rates. 
  
  
• The Regel-air® ventilation system FFL-uni  and Regel-air® ventilation system FFL-quick 
  The FFL-uni is a universal vent for PVC, wood, wood-aluminium and aluminium windows, which is securely screwed to the window frame. The FFL-quick is suitable for all standard PVC, wood, wood-aluminium windows and can be easily installed using pre-fitted adhesive tape. The FFL-quick is not suitable for aluminium windows. The Regel-air® FFL-quick and the FFL-uni are self-regulating window rebate vents. They are ideal for retrofitting (with the exception of flush-fitting windows).
  
  

Window rebate vents & ventilation systems for wood and wood-aluminium windows

There  are three different ventilation systems for wood and wood-aluminium windows from Regel-air®: The vents FFLH Type 14/24, FFLHA Type 23 and FFLHmax Type 44.

• The Regel-air® window rebate vents FFLH for wood and wood-aluminium windows ensure a reliable minimum air exchange to protect against damp through passive ventilation.
  
  The vents are suitable for two different applications. The standard Regel-air® FFLH Type 24 is primarily intended for factory installation. The Regel-air® FFLH Type 14 is suitable for retrofitting in existing windows.
  
  The basis for both vent Types 24 and 14 is the classic Regel-air® FFL. The flaps in the vents react to wind pressure and close automatically as wind pressure increases.
  
  To ensure the minimum air change rate is met in special constructions, such as arched windows, the ventilation systems can also be installed vertically. The 24 RF and 14 RF models are suitable for this purpose. Thanks to a return spring in the flaps of the window rebate vents, it is ensured that the flaps re-open automatically after closing.
  
  
• The Regel-air® FFLHmax Type 44 is a self-regulating window rebate vent and the systematic further development of the FFLH Type 24. The new version utilises the well-known flap technology, which has proven its worth over the last 25 years and reacts to wind pressure. Installation is carried out as usual . The ventilation ducts are visible and even easier to clean.
  
  

Not only are air flow rates of over 15 m³/h at 8 Pa achievable, but sound insulation levels of 42 dB can also be achieved, depending on the combination and arrangement.

• The ventilation system Regel-air® FFLHA Type 23 is an automatic ventilation system for wood-aluminium windows. In wood-aluminium windows, the Regel-air® window rebate vents FFLHA must only be used as a supply air device in conjunction with permanently operated, fan-assisted extract ventilation systems.
  
  

Window rebate vent & ventilation systems for aluminium windows

There are two different  Regel-air® vents for installation in the window rebate of aluminium windows: The vent types FFL and FFL-uni

• The Regel-air® system FFL is also used in aluminium windows. Together with various system integrators and profile manufacturers, reliable solutions have been developed for passive ventilation using the vents: The rebate vent is fitted into a moulded component which replaces the centre gasket in the area of the vent. This installation method ensures that the sealing plane is not interrupted and guarantees an adequate air exchange.
  
  
• If no solution is available for the appropriate profile, the Regel-air® vent FFL-uni can be used. This all-rounder fits all windows with an overlapping sash.

Window rebate vent & ventilation system for all materials

The universal vent for all materials from Regel-air®: FFL-uni

• The Regel-air® FFL-uni is the universal solution for PVC, wood, wood-aluminium and aluminium windows.
  
  The FFL-uni is a self-regulating window rebate vent, which is suitable for factory fitting, but is also ideal for retrofitting . The FFL-uni fits virtually all windows and window types (with the exception of flush-fitting windows). The window rebate vent features two independently adjustable flaps, which regulate the airflow to prevent draughts. The Regel-air® FFL-uni is screwed onto the upper window frame using a drilling and cutting template.
  
  By using the FFL-uni enables controlled air exchange and reliable dehumidification without draughts.
  

Window rebate vents put to the test: pros and cons in a nutshell

What are window rebate vents?

• Window rebate vents are ventilation units that are typically fitted into the window rebate. When the ventilation flaps are open, fresh air can flow unhindered into the living spaces, supplying them with oxygen. This significantly improves the indoor climate.
• Mechanical ventilation systems enable a continuous air exchange, which removes moisture and allows fresh air to flow in.
• Ventilation concepts for the forced ventilation of living spaces and heated basement rooms. Heating systems or the combustion air supply can be easily implemented using window rebate vents.
• Automatic window ventilation serves to regulate pollutant and moisture levels and improves air quality in the house and flat.

What are the advantages and disadvantages of window rebate vents?

Advantages:

• Regulation of humidity
• Ideal air exchange without draughts
• Mould prevention
• Reliable forced ventilation & combustion air supply
• Low costs
• Low maintenance
• Window rebate vents are also a good solution from an aesthetic point of view, as they are partially concealed within the window frame. They are easy to clean when the window is open.

Disadvantages:

• Not a comprehensive solution to mould problems

How do window rebate vents work?

• Window rebate vents are fitted in the rebate area of the windows. They ensure continuous air circulation in the flat – even when the windows are closed.
• The air flow rate for window rebate vents depends on both the building’s location and wind pressure.
• They operate entirely mechanically and require no electricity.
• Draughts are prevented by the automatic closing of the ventilation flaps.

What is window rebate ventilation?

Window rebate vents allow for a constant exchange of air, which removes moisture from the flat or house and allows fresh air to flow in. The improved indoor climate helps to regulate levels of pollutants and moisture.

Do window rebate vents work when the window is closed?

Yes, window rebate vents allow for continuous air circulation whilst the window is closed.

What alternatives are there to window rebate vents?

Centralised or decentralised ventilation systems enable safe and comfortable air exchange. They support heat recovery and allow the outside air to be preheated. However, centralised and decentralised systems are much more expensive to purchase than window rebate vents and also require maintenance.

Window rebate vents and energy efficiency

Window rebate vents operate continuously and require no external power supply, making them an efficient solution. The minimum air exchange can take place automatically, without the need for the user to open the windows. Reducing indoor humidity has been shown to lower heating costs and improve indoor air quality. Problems with damp and mould growth are prevented.

How much does it cost to install window rebate vents?

The costs and installation effort involved with window rebate vents are significantly lower than with a ventilation system. The systems are inexpensive and easy to install.

Light forced ventilation in thermally insulated buildings

New-builds are often perfectly airtight, which can lead to mould problems. These more airtight buildings require a change in ventilation practices. According to GEG and DIN 1946-6, ventilation concepts are necessary for new-builds and refurbishment projects. The window rebate vent is an affordable alternative to complex ventilation systems.

Conclusion: window rebate vents or ventilation system?

Whether a window rebate vent is suitable for your building is always a matter for professional assessment. The needs of the occupants, the condition of the building, the use of the rooms and the condition of the existing ventilation systems all play a decisive role. If you have any questions, please feel free to contact our team.