An array of fixed louvres, fins or panels above or in front of a window to create shade.  Also known as a sunbreaker.

Originally made from timber, concrete or formed steel, most modern sunbreakers are constructed from roll formed or extruded aluminium.  Louvres can be of any size or shape.

Support arms are typically made from aluminium box sections and bolted back to the building structure at a suitable spacing above the window.  The support arms are usually horizontal, but can be angled, vertical or any combination.  Louvres are generally spaced to provide optimum shading.  Sun angles vary depending on latitude and building orientation.

In the United Kingdom the sun breaker is often designed to keep out high summer sun which causes the greater heat gain whilst allowing in low sun which causes little heat gain, but some glare which can be dealt with by using a secondary internal blind.

Components

• Louvre (also fin or slat) - of roll formed or extruded aluminium.
• Support arms - aluminium or steel box section or channel.
• Braces - aluminium or steel angle, tube, box section, rod or tensioned cable.
• Louvre clips - aluminium or moulded nylon.
• Front rail - aluminium section.

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