The office building of the RENSON Company is located in Waregem, in Belgium.  The RENSON Company produces natural air ventilation products and solar shadings systems with fixed or moveable lamellas.

The building has been designed by the architect Jo Crépain.This building has won the Energy Award 2003 (Belgian reward), price decreed by the Royal Federation of the Belgian architect company.

The RENSON building is interesting on several points of view; this sustainable building is the window of the company products (solar shading and natural ventilation products). From the beginning of the project, it has been decided to avoid air-conditioning system by favouring the natural ventilation and lowering solar heat gains by the use of movable solar aerofoil blades. The natural ventilation system has been studied from the beginning of the project and, as there is no false-ceiling, a large part of the building thermal mass is accessible. The summer overheating risks are thus reduced. The south-west façade is totally glazed and has no particular solar shading system, except a horizontal overhang. The south-East façade is protected by movable louvres of ellipsoidal shape made in anodic aluminium. These louvres of Icarus IC300 and Icarus IC 360 type, sold by the company, are grouped in 3-element blocks that are manually ordered by the office occupants. The louvre inclination can change, in order to regulate the daylight and solar penetration into the room. Two office rooms have been modelled and analysed under artificial sky, in order to characterise the light penetration and to compare the results with in-site measurements. The scale model and in-site results are close to each other.These measurements show that the aluminium louvres installed on the south-east façade reflect the light deeply into the room, when placed horizontally. When the louvres are sloped from 0° to 45°, they play more a rule of light or sun protection.