Rationel UK manufacture high performance timber windows and doors. There is also a composite range of aluminium clad timber windows and doors which provide contemporary and low maintenance attributes. Windows and Doors are "secured by design" and can be specified into all residential, commercial and public projects.

Crittall Composite Windows is a specialist division of Crittall Windows which specialises in the supply of Composite windows for both residential and commercial construction & renovation. Composite windows are aluminium clad timber windows which provide both sustainability and durability to window specification. Crittall can provide full technical assistance and CAD drawings to facilitate the specification of these high performance composite windows.

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