18" X 24" Or 24" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 25.75] Height_22in Actual Filter Size – 19 Suitable for all AC 8in diameter 12125SDCLNGBX

Actual Filter Size – 19 3/4"w x 29 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 20" OR 20" x 18" duct opening (measured at the opening)

+ Product Details Size - 28"w X 6"h X 2"d (for duct opening measurement only)

adds an extra layer of protection

18" X 24" Or 24" X 18" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 19.75 X 25.75] Height_22in Actual Filter Size – 19 Suitable for all AC 8in diameter 12125SDCLNGBX Actual Filter Size – 19 3 4"w x 29 3 4" x 1" + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 20" OR 20" x 18" duct opening (measured at the opening)