With the intermediate grading stationt SV behind the pre-planer, up to 30 % of the parquet blocks can be selected into the next higher grade because the selection of the best side for the top face is much easier and faster on a planed surface than from the raw sawn surface. At first the blocks are turned top side up when leaving the pre planer. For the selection of the best face the blocks are fed (slowly) on a cross-feed belt and then turned again, before feeding into the 4-side parquetry planer. The intermediate grading system SV is available in various lengths and widths, depending on max. length of the blocks and average feed speed.