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New Weather Louvre Specification Guide launchedJanuary 2012

A weather louvre is a passive device, essentially a grille fixed over an opening, designed to let air through whilst restricting the entry of rain.

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. Subtleties of blade profile and pitch (distance between blades) are among the design features that affect performance.

This guide has been compiled to help system designers and specifiers of weather louvres to achieve optimum performance.

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, both of which represent unnecessary cost. Improved efficiency of louvre design not only saves money but may assist with building regulations compliance and contribute to an improved energy rating for a building.

The guide 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

This guide is available to order for GBP20 or GBP10 to BSRIA members. The pdf version can be downloaded by all. Visit webpage, contact the bookshop on or tel 01344 465529

*Recipients of the quarterly mailing will receive a copy of this guide shortly*