Large Structures, Closed Or Minimum Ventilation In closed structures with little to no ventilation, propel the fog the length of the structure with the first fan row no more than 40' from the end wall. The first fan should either be: centered along the end wall OR placed no more than 40' from the side wall, with the additional fans in the row equally spaced no farther than 80' apart. Lengthwise, fans should be equally spaced and no farther apart than 80'. All fans should be equipped with oscillation, sweeping 360°. See also: Installation Tips • Small Structure Diagram • Large Structure Diagram (Natural Ventilation) • Large Structure Diagram (Forced Ventilation) • Two Fan Placement Diagram
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