Door Louver, Material Steel, Finish Gray Primer, Louver Opening Height 8 1/2 in, Louver Opening Width 16 1/2 in, Rough Opening Height 8 1/2 in, Outside Height 10 1/8 in, Outside Width 18 1/4 in, Free Area 0.5 sq ft, Flange Width 1 1/4 in, Maximum Door Thickness 2 1/4 in, Minimum Door Thickness 1 3/8 in, Rough Opening Width 16 1/2 in, Blade Angle 45 Degrees, Adjustable Blades No, Intake or Exhaust Application Exhaust, Intake, Includes Fasteners, Number of Blades 14.
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