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The two main goals of a paper machine dryer hood air system are to remove the water vapor that is evaporated from the sheet in the dryer section and to control the temperatures, humidities, and air flows around the sheet in the pockets across the full machine width. By satisfying these two goals, the hood air system increases the drying capacity of the machine, improves sheet moisture profiles, reduces stain requirements, and improves the runnability of the dryer section. The benefits of a properly designed and operated hood air system are improved sheet quality, increased production, and improved energy efficiency.