BSRIA Guide
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A weather louvre is a passive device, essentially a grille fixed over an opening, designed to let air through and keep water out. It is designed to perform both these functions simultaneously and its suitability for a particular application is determined by how effectively it achieves these functions in combination. Failure to understand and clearly express the performance requirement at the design or procurement stage increases the risk of the product not being fit for purpose. The end user may experience unwanted water penetration or wasted energy. This guide has been compiled to help system designers and specifiers of weather louvres to achieve optimum performance. It explains: - How to understand weather louvre requirements - How to minimise whole-life costs through system design and louvre selection - Which terms to use to ensure that performance data are consistently stated when sourcing products from suppliers - How to minimise risks associated with overstated performance claims