Disclosed herein is a slatted screen 10 comprising a frame comprising first and second opposite side members 12 and first and second opposite end members 14. A plurality of slats 18 extend between the side members 12. The slats 18 lie in a common plane P and comprise a first and second end slats 18a at opposite ends of a plurality of intermediate slats 18b. The intermediate slats 18b comprise a first group of slats 18b1 and a second group of slats 18b2, wherein the slats of the two groups are interspersed with each other. The slats 18b1 of the first group are angled relative to the common plane P at different angle to the slats 18b2 of the second group.