Which type of frame is suitable for my needs?

A window or door should allow the entrance of natural light; satisfy the need for insulation, security, interior space functionality while offering an acceptable quality - to – cost ratio.  

The decision should be taken at the beginning of the design process and take into account the climatic conditions of the building site as well as the architectural style of the building itself. Careful consideration should be given to the appropriate window system and  type. For example, an economical system has more design restrictions compared to a high performance  one.

Alumil categorizes its window frame systems in opening and sliding:

Opening systems

	They offer effective insulation, high safety; they are available in several types and typologies and support glazing, insects net, shutters or external rolls
	The span reaches the whole system opening dimensions, but needs a big interior space in order to be functional
	Are mostly used in South Europe and mainly placed in individual and rural residences as well as in special constructions
	They are also used in replacements / refurbishments of old wooden frames
	Are ideal for traditional style contractions
	Are available with or without thermal isolation
	Compared to sliding aluminium systems they offer unlimited applications and solutions. They also incorporate a lot of accessories and mechanisms, covering each particular requirement, thus being priced higher

Sliding systems

	Economy of space is the main advantage of these systems. Thus, they are mainly used in mass constructions – blocks of flats - where economy of space is a necessity
	Sliding systems consist a trait of the Greek window market and used to have the largest market share in the ' 70s and ' 80s
	The current lines are fully adapted to the market needs and offer high sound reduction and heat insulation attributes
	They need minimum space in order to function and support glazing, insects net, shutters and external rolls
	They can either be embodied in the wall (offering the full extent of the opening) or placed externally
	They can also be double-folded in the centre of the opening, or parallel moving one on top of the other or multi-door with proportional operation

What is a window frame supposed to offer?

A frame is supposed to offer:

	Protection from the exterior environment: - Temperature - Sound - Air - Rain and snow - Dust
	Safety
	Room Ventilation
	Easy entarnce and diffusion of natural lighting
	Minimal maintenance
	Resistance against weather conditions and erosion
	Visibility
	Functionality
	Extended life duration