Return Air Grille Overall Depth 3 1/2 in Overall Height 23 3/4 in Overall Width 23 3/4 in Maximum Opening Height 6 in Maximum Opening Width 14 in Filter Depth Not Applicable Filter Height Not Applicable Filter Width Not Applicable Grille Color White Grille Material Steel Material Steel Damper Material Not Applicable Bar Spacing 1/8 in Face Design Perforated Airflow Directions One-Way Adjustable Blades No Mounting Location Ceiling or Wall Mounting Style Lay-In