This system is often a central slotted display screen in radial flow reactors. It’s outer floor contacts the catalyst layer and is created for a slit monitor of triangular wire. This unit retains the packing and directs the flow to the outlet. A collector/distributor makes use of a header pipe https://wedge-wire-screens22110.blogkoo.com/radial-flow-reactor-scallop-no-further-a-mystery-52895170