16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Adjustable Curved Blade Actual Filter Size – 17 4 X 12 Is CRFG2028 Width_14in

Actual Filter Size – 17 3/4"w x 11 3/4" x 1"

+ Product Details Size – 16"w X 16"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 5 3/4" x 1"

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 8" duct openings

16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Adjustable Curved Blade Actual Filter Size – 17 4 X 12 Is CRFG2028 Width_14in Actual Filter Size – 17 3 4"w x 11 3 4" x 1" + Product Details Size – 16"w X 16"h is the size for the duct opening measurement only