Photo 1 of HVAC OV 4.5" x 4.5" Inch (Grille Dimensions) White Plastic Square Vent Cover - HVAC Air Return Grille - Built-in Protection Screen - 5.9" x 5.9" Inch (External Dimensions)

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Photo 1 of HVAC OV 4.5" x 4.5" Inch (Grille Dimensions) White Plastic Square Vent Cover - HVAC Air Return Grille - Built-in Protection Screen - 5.9" x 5.9" Inch (External Dimensions)Photo 2 of HVAC OV 4.5" x 4.5" Inch (Grille Dimensions) White Plastic Square Vent Cover - HVAC Air Return Grille - Built-in Protection Screen - 5.9" x 5.9" Inch (External Dimensions)