Owing to their diversified functionality, external roller shutters constitute an integral part of modern structural technologies.

They provide a perfect protection against the sun, wind, rain, snow and other atmospheric conditions. They improve thermal insulation of a building considerably offering measureable benefits in summer and winter periods.

Windows let in up to 80% of the sunlight leading to excessive sun exposure of rooms in the summer. Owing to use of external roller shutters, it is easy to limit this undesired effect.

Contrary to internal rollers shutters, external roller shutters reflect sunrays from the pane preventing rooms from overheating.

In the summer you can feel the advantages of external roller shutters such as shading and pleasant coolness in rooms. In the winter, external roller shutters decrease deemed of buildings for Energy, thus decreasing costs of heating considerably (even up to 30%). External roller shutters also increase acoustic insulation decreasing the level of noise in a room. They ensure privacy and feeling of safety of dwellers.

The roller shutters offered by BONA have been proved for more than 20 years and the systems are still improved. Form a shaft to rollers, through retractors, handles, ball bearings, belt guides and transmissions to specialist axles with handles – they provide proven solutions for years.

SK 45^o system is suitable for use in existing buildings. Roller shutters are rolled up into an aluminium box placed on the wall or in the reveal. Thus, the box is a decorative element adjusted to appearance of the building.

An engine can also be used.