Wedge® Downspout Screen. The patented flow-thru design of the Wedge® Downspout Screen directs leaves and debris to float up and away from the downspout opening, keeping it clear so rainwater can drain quickly and efficiently. The screened sloped on the Wedge® Downspout Screen's design allows water to flow through the top, bottom, both sides and back, providing increased drainage over conventional rain gutter filters. (Other leaf filters can clog and stop the flow of rainwater even before it reaches the downspout!)