RATIONEL
Clean lines, subtle detail and limitless options. Rationel is a versatile solution that covers everything from modern passive projects to traditional homes.
Clean lines, subtle detail and limitless options. Rationel is a versatile solution that covers everything from modern passive projects to traditional homes.
As one of Europe leading window and door manufacturers, Rationel offer versatile range of premium quality products that are simple and elegant in design with state of the art functionality.
As one of Europe leading window and door manufacturers, Rationel offer versatile range of premium quality products that are simple and elegant in design with state of the art functionality.
Rationel windows are crafted from high grade FSC certified timber combined with a slim external aluminium cladding. This gives all the cosmetic and thermal benefits of natural wood inside and longevity and easy maintenance outside. 

Rationel provide solid workmanship, high thermal values, SBD ironmongery, and are suitable for passive house builds.
Rationel windows are crafted from high grade FSC certified timber combined with a slim external aluminium cladding. This gives all the cosmetic and thermal benefits of natural wood inside and longevity and easy maintenance outside. 

Rationel provide solid workmanship, high thermal values, SBD ironmongery, and are suitable for passive house builds.
W IND RESISTANCE 1 600PA A IR PERMEABILITY 6 00PA
O PERATION 1 0.000 CYCLES W ATER TIGHTNESS 6 00PA
Rationel FORMA windows are made entirely from timber. The angled glazing bead and OVOLO moulded pro file make it an ideal choice for country-style and traditional designs. 

Rationel FORMA ensures that high levels of daylight and solar heat gain are achieved. This free heat is the best energy source available and also provides a healthy and comfortable indoor climate. 

These windows come with security ironmongery as standard, and are suitable for Passiv Haus buildings.
Rationel FORMA windows are made entirely from timber. The angled glazing bead and OVOLO moulded pro file make it an ideal choice for country-style and traditional designs. 

Rationel FORMA ensures that high levels of daylight and solar heat gain are achieved. This free heat is the best energy source available and also provides a healthy and comfortable indoor climate. 

These windows come with security ironmongery as standard, and are suitable for Passiv Haus buildings.
The design of FORMA PLUS is slim and traditional, available in a range of country-style designs with various configurations of glazing bars. 

The slim design also allows maximum natural light into the home. Made from timber, with external aluminium cladding, Rationel FORMA PLUS offers all the benefits of natural wood on the inside and easy maintenance on the outside. 

The range is available with security ironmongery as standard, and are suitable for Passiv Haus buildings.
The design of FORMA PLUS is slim and traditional, available in a range of country-style designs with various configurations of glazing bars. 

The slim design also allows maximum natural light into the home. Made from timber, with external aluminium cladding, Rationel FORMA PLUS offers all the benefits of natural wood on the inside and easy maintenance on the outside. 

The range is available with security ironmongery as standard, and are suitable for Passiv Haus buildings.
Our ‘energy-contributing’ Rationel AURA windows offer the same excellent properties as Rationel AURA PLUS, but these windows are made entirely from timber. 

You can therefore combine a beautiful natural look with a clean contemporary design. Rationel AURA ensures that high levels of daylight and solar heat gain are achieved. This free heat is the best energy source available and also provides a healthy and comfortable indoor climate. 

These windows come with security ironmongery as standard, and are suitable for Passiv Haus buildings.
Our ‘energy-contributing’ Rationel AURA windows offer the same excellent properties as Rationel AURA PLUS, but these windows are made entirely from timber. 

You can therefore combine a beautiful natural look with a clean contemporary design. Rationel AURA ensures that high levels of daylight and solar heat gain are achieved. This free heat is the best energy source available and also provides a healthy and comfortable indoor climate. 

These windows come with security ironmongery as standard, and are suitable for Passiv Haus buildings.
The design of AURA PLUS is slim and elegant, creating a stylish over all architectural appearance, whether you are building a new house or refurbishing an existing one. The slim design also allows maximum natural light into the home. 

Made from timber, with external aluminium cladding, Rationel AURA PLUS offers all the benefits of natural wood on the inside and easy maintenance on the outside. 

The range is available with security ironmongery as standard, and are suitable for Passiv Haus buildings.
The design of AURA PLUS is slim and elegant, creating a stylish over all architectural appearance, whether you are building a new house or refurbishing an existing one. The slim design also allows maximum natural light into the home. 

Made from timber, with external aluminium cladding, Rationel AURA PLUS offers all the benefits of natural wood on the inside and easy maintenance on the outside. 

The range is available with security ironmongery as standard, and are suitable for Passiv Haus buildings.
Fixed Light windows are
ideal wherever maximum
internal light and solar
heat gain is required.
Side Hung windows are
available with a friction
brake that can hold the
sash in the open position.
Top Guided windows are
a simple and user-friendly
design. Opening is
controlled by concealed
tracks and slides.
Has no visable hinge
when closed, and opens
towards the middle of the
frame allowing the glass
to be cleaned internally.
Top swing are fully
reversible. Turn the sash
through 170 degrees to
clean the glass from the
inside.
Dual operation from a
single handle. Tilting
inwards from the top or
hinging from the side.
Popular in pasiv haus.
The entrance door is the gateway to a house. It is important to carefully consider the opening and closing functions and the designs available. They are available as inward or outward opening.
Terrace doors are available as either inward or outward opening and are ideal for access to balconies, gardens and patios. A Terrace door from Rationel is made to measure and therefore always matches your needs perfectly.
The window door is outward opening only and is ideal for access to balconies, gardens and patios. Window doors come fitted with an inbuilt friction brake, operated by turning the handle down in any given position.
Rationel sliding patio doors are designed to be beautiful as the views they frame. The sliding sash lifts easily and glides in front of the fixed section, ideal when space is at a premium.
Enhance the appearance and character of your house through your choice of colour. Rationel can offer any colour from the RAL classic range to complement the modern architectural profiles of FORMA/FORMAPLUS/AURA/AURAPLUS as well as subtle Granite tones specifically for FORMAPLUS/AURAPLUS.
Energy-efficient glazing reduces thermal loss, and therefore your overall heating bills. The space between the double glazed panes is filled with argon gas, which is a much better insulator than air. 

Rationel OBSCURE panes are designed to restrict the view into private areas such as bathrooms. As the translucent patterns are located on the inside of the panes, they can still be cleaned like traditional glazing.
For more information regards the Rationel product range please visit:

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