The document discusses different types of aluminium doors and windows. It describes how aluminium doors and window frames are made from extruded aluminium sections with channels and box sections containing grooves for double glazing and weather-stripping. Different types of aluminium doors are shown, including patio doors, casement hinged doors with top fixes, and different styles of aluminium windows like fixed windows, sliding windows. Heat transmission through aluminium can be reduced by using insulating materials to separate aluminium profiles.