Rainproof louver

In a multiple-blade, substantially rainproof, air flow louver, having a perimeter frame and a plurality of individual, vertically spaced blades extending horizontally across between elements of said frame, and drainage means at at least one end of each of said blades, the improvement consisting of specially configured blades, said blades being positioned with their outer horizontal edges at a level lower than their inner horizontal edges, the main surfaces of said blades extending between said outer and inner edges being interrupted with upward and inward water-flow retarding configurations, the inner-upper edges of said blades having outwardly extending return lips for preventing water flow thereover inwardly thereof, and the outer-lower edges of said blades having water receiving gutter elements communicating with said drainage means at at least one end thereof, each of said gutter elements consisting of a bottom, a vertical flange at the outermost edge of said bottom, and an inwardly extending anti-splash lip at the upper edge of said vertical flange, said lip extending downwardly at an acute angle toward the main surface and overlying said gutter element a sufficient distance substantially to eliminate impingement of water drops from superior blades into said gutter element.