. _:vb50769429 _:vb50769432 . . . _:vb50769434 . _:vb50767579 . _:vb50769433 . _:vb50767579 . _:vb50769431 . _:vb50767579 . _:vb50769434 . _:vb50769434 . "Louver" . . _:vb50769432 _:vb50769433 . . _:vb50769429 _:vb50769431 . "Device consisting of an assembly of parallel sloping vanes, intended to permit the passage of air while providing a measure of protection against environmental influences"@en . _:vb50769431 . _:vb50769430 _:vb50769429 . _:vb50769431 . _:vb50769431 . _:vb50767579 . _:vb50769432 _:vb50767579 . _:vb50769430 . _:vb50769434 . . _:vb50769433 _:vb50769434 .