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A two cell ipr system in west alabama in 2008. walls are made of wood and galvanized wire mesh frame covered with plastic. each unit is 16 ft. wide by 80 ft. long. 1.5 hp blowers located in each raceway cell provide aeration and water movement. at peak fish load, additional diffuse air or pure oxygen can be added to increase d. o. notice location of the ipr between the dike of 2 ponds.