Modular screen support deck (1) comprising first (2) and second (3) deck sides extending in parallel with each other defining a deck plane between the two deck sides. Further, a first extension structure (8) connected to the first deck side is provided, the first extension structure extending inwardly from the first deck side and comprising a first connection structure, the first connection structure being arranged a distance from the first deck side and a second extension structure (9) connected to the second deck side is provided, the second extension structure extending inwardly from the second deck side and comprising a second connection structure, the second connection structure being arranged a distance from the second deck side. The support deck further comprises a first cross-member (4) with a first end connected to the first connection structure and a second connected to the second connection structure.
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