Architectural louvre ventilation products are systems made from groups of either fixed or operable blades, mounted in a frame. The purpose of a louvre is to let in the required light and air whilst keeping out unwanted elements such as water, dirt, direct sunshine, noise and debris.

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As an option they can be fitted with bird guards and insect mesh to stop wildlife from entering. These systems have been designed to achieve optimum efficiency and have been tried and tested with regard to free area, water penetration and resistance to airflow (pressure loss).