Forma & FormaPlus
Designed for a more traditional style of building, the Rationel FORMA window has an all-timber construction with slim, non-continuous bars. Featuring an ovolo moulded profile and angled glazing bead, FORMA is perfect for older, classic and country style houses. The aluminium external cladding also has a unique curved edge.
In terms of frame construction, the Rationel FORMAPLUS window is identical to FORMA. The only difference between them is the addition of external aluminium cladding included on the FORMAPLUS window. This inclusion ensures both minimum and easy maintenance characteristics.
Rationel Windows is a manufacturer with more than 60 years’ experience. Rationel employs 1,050 people in Denmark, England, Ireland and Poland, manufacturing premium-quality, durable and stylish windows and doors.
Rationel Aura and AuraPlus Options
Both Forma and FormaPlus have a wide variety of opening designs, glazing options and configurations. Along with the typical styles, Rationel FORMA and FORMAPLUS can be manufactured in bespoke shapes to correspond to an assortment of openings. Featuring fully adjustable and secure ironmongery (Secure by Design part Q compliant hardware), two gaskets and the option of trickle vents, FORMA and FORMAPLUS are carefully engineered with the customer in mind. Furthermore, all Rationel products prioritise energy efficiency. The slim design naturally takes advantage of the solar heat from daylight, and their exceptional insulating qualities reduce CO2 emissions significantly.
Due to their energy efficient characteristics, both Rationel FORMA and FORMAPLUS are suitable for Passiv Haus buildings.
Thanks to constantly enhancing efficiency and optimising their products, Rationel windows are designed to withstand all weather types, attempted break-ins, and the constant wear and tear of opening and closing windows year after year.
Rationel aluminium profiles are coated with a minimum of 60 microns thickness and are pre-anodized so can be called marine grade. The windows and doors will require regular maintenance as per the OE manual shown in the downloads tab of this page.
Efficiency, Solidity, Dependability
The Rationel product development is primarily based on the Danish market and climate which is predominantly coastal – similar to northern Scotland – so the products are suitable for coastal locations. We treat the aluminium for filiform corrosion prior to powder coating, and the products are also salt-spray tested at R&D stage. Furthermore, salt-spray batch testing is completed on all metal components, from cladding to hinges.
“We basically offer a complete service. For over 60 years, our company has been based on excellent craftsmanship. This is still the case. At Rationel we take pride in delivering high quality,” Rationel CEO, Thomas Tvedergaard Larsen.
Typical Lifespan FORMA: 60 years
FORMAPLUS: 85 years
Lead Time 8-10 weeks from sign off Best U-Value 0.78 W/m^2k Finishes Any RAL Colour
for both timber and aluminium (FORMAPLUS only)
Glazing Double, Triple, Obscure, Solar, Laminated, Toughened Performance and
Air Permeability: 600 PA
Wind Resistance: 1600 PA
Operation: 10,000 cycles
Water Tightness: 600 PA
Maximum Sizes CLICK HERE FOR SIZES Manufactured in Poland
We have and extensive range of doors available in Rationel Forma and FormaPlus, the images above show some of the general configuration options available. For more information about the opening types and how each can best be used see our Bespoke Doors page.
RAL Colour options in the standard range for Rationel products
RAL Classic colours outside Rationel’s standard colour range will be subject to additional costs and lead times.
For clear lacquer and granite textured colours (FormaPlus & AuraPlus only) please see page 7 of the Rationel Aura & AuraPlus Brochure.
RAL1035 – Pearl beige
RAL7001 – Silver grey
RAL7003 – Moss grey
RAL7013 – Brown grey
RAL7021 – Black grey
RAL7022 – Umbra grey
RAL7037 – Dusty grey
RAL7044 – Silk grey
RAL8017 – Chocolate brown
RAL8019 – Grey brown
RAL8022 – Black brown
RAL9002 – Grey white
RAL9004 – Signal black
RAL9007 – Grey aluminiumWhere you see a next to a colour, clicking on it will take you to a page of our client galleries that use that RAL Colour.
Some colours are subject to additional lead time from Rationel.
Colours shown should not be used in place of an official RAL colour sample. We cannot guarantee colour-accuracy when viewed on-screen or printed out.