traditional style
Rationel FORMA & FORMAPLUS
The FORMA range consists of all-timber windows with slim, non-continuous bars. The FORMAPLUS range is similar to the FORMA range, produced with the same solid timber construction. This product range is also ideal for new build if a classic expression is desired.
Product Details
Can be supplied with trickle vents
Adjustable hinges – keeps the
windows tight
Angled glazing bead
Chamfered internal profile /Slim 25
glazing bar option
opening functions
FORMA/FORMAPLUS windows and doors are available in a variety of opening designs to suit your lifestyle and the character of your home. The units can also be combined to create impressive expanses of glazing, complex patio door configurations or conservatories.
Fixed Light 
Topguided Window 
Sidehung Window 
Topswing Window 
sideguided Window 
Entrance Door 
Panelled Door 
Window Door 
Terrace Doors Sophisticated colours
We offer a standard range of sophisticated colours to compliment the modern architectural profiles of FORMA/FORMAPLUS as well as subtle Granite tones specifically for FORMAPLUS.
Granite colours (only for FORMAPLUS)
Special Colours
For an additional cost, you can also choose any non-standard RAL-colours to enhance your project.
Note: we cannot guarantee a precise colour match with the above examples, so it is important that you use genuine RAL colour cards when making your selection.
panes/glass
For FORMA and FORMAPLUS, you can choose from a wide selection of energy efficient panes, depending on the function of the window in your home.
Rationel OBSCURE 
Rationel SOLAR 
Rationel SOUND 
Rationel SECURE 
Rationel FACADE 
Rationel SAFETY