Horizontal sliding secondary windows are very versatile and allow easy access to the outer window. The sashes slide within the frame and hence there are few problems with blinds, curtains or ceiling bulkheads.
Individual windows can be linked with mullions and transoms allowing both large and ribbon windows to be successfully treated.
Series 10 is a slim system that treats most casement style windows and is also available with a triple track.
Series 80 is a heavy duty system designed to treat large windows and through use of thicker glass, provide higher levels of acoustic insulation or security.
Series 85 is a high security system offering resistance against intruder attack or blast
Horizontal sliding units are generally available in 2, 3 or 4 panel versions but additional panels can be considered in special circumstances.
The 3 panel unit is available in three versions - one in which the centre sash normally remains static and one in which it slides independently. The choice will depend upon access requirements to the outer window. Finally there is a triple track version (Series 10) that allows 2/3rds access to the outer window.
A range of aluminium coupling mullion / transom sections are available to link windows both vertically (mullion) and horizontally (transom). Long span transoms will require additional supports in the form of vertical hangers or full height box sections set behind the interlock points of the window.