1Pack Dayton 4FZF4 Louver Wall Opening 24 x 24 In Aluminum

1Pack Dayton 4FZF4 Louver Wall Opening 24 x 24 In Aluminum Modular Intake Louver Fixed Louver Max. Exhaust 1 918 cfm Louver Max. Intake 1 342 cfm Intake Louver Outside Height 23 1/2 in Intake Louver Inside Width 21 in Louver Free Area 1.384 sq ft Louver Material Aluminum Min. Wall Opening (In.) 24H x 24W Flange Width (In.) 1 1/4 in Mounting Hole Size (In.) - Number of Blades 3 Inside Height (In.) 11 in Max. Velocity (FPM) 3 000 Outside Width (In.) 23 1/2 in Blade Angle (Deg.) 45 For Use With Intake or Exhaust Applications