of the wall element 6b are bent angularly at 6b 39 so that the wall element has an approximately u shaped cross section the lower terminal portion 6b 34 of the wall element 6b which is situated in the zone of the air outlet openings 5a 5b of the feed chute 1 is oriented parallel to the lateral walls 1a and 1b of the feed chute 1 the wall element 6b may be in case of a sufficient own weight supported at its upper zone edge 6b 34 39 at the wall 1b the lower part 6b 34 may be supported by means not shown at its side on the chute wall where the air outlet openings 5a 5b are provided fig5 illustrates a vertical fiber tuft divider 17 which is arranged in the feed chute for dividing it into two partial chutes the upper rounded part of the divider 17 may reach approximately to the mid height of the feed chute 1 while the lower zone of the divider 17 extends into the divided fiber tuft columns 8a 8b which leave the fiber chute 1 as respective divided laps 9a 9b the lateral walls 1a and 1b of the feed chute 1 are each associated with a wall element 6c and 6d respectively whose upper respective ends 18 and 19 extend into respective support devices 20 and 21 through non illustrated slots provided in the lateral walls 1a and 1b the support devices 20 and 21 are situated at the outside of the lateral walls 1a and 1b the upper ends 18 and 19 of the respective wall elements 6c and 6d are vertically displaceably arranged in the support elements 20 and 21 so.