20" X 12" Or 12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Compatible with Duct 10" + Product Details Size - CRFG126 Curved Blade Steel hp birdscreen close

+ Product Details Size - 6"w X 24"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 28" OR 28" x 18" duct opening (measured at the opening)

+ Product Details Size – 12"w X 14"h or 14" x 12" is the size for the duct opening measurement only

+ How To Measure A Grille Overall Size:

Our Aluminum Ceiling Diffuser is not only a design marvel but also a practical choice for your HVAC system

20" X 12" Or 12" X 20" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 21.75 X 13.75] Compatible with Duct 10" + Product Details Size CRFG126 Curved Blade Steel hp birdscreen close + Product Details Size 6"w X 24"h X 2"d (for duct opening measurement only) + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 28" OR 28" x 18" duct opening (measured at the opening)