16" X 30" or 30" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 31.75] Mounting Bracket + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening)

+ Product Details Size - 14"w X 18"h X 2"d (for duct opening measurement only)

Actual Filter Size – 31 3/4"w x 13 3/4" x 1"

1-1/8" - 2334 PSI

16" X 30" or 30" x 16" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 17.75 X 31.75] Mounting Bracket + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening) + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening)