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A typical profiling steam box consists of a steam supply header and a distribution chamber with a perforated plate facing the paper sheet. The distribution chamber is divided into several zones. Each zone has an automatic valve that controls the flow of steam from the header into the distribution chamber. A downstream moisture scanner is typically used to measure the paper moisture. The moisture profile data is then used to control the valves, so more steam is applied to wet zones and less steam is applied to dry zones.