36"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 23.75"h] 14" Diameter Every grille has a front 4 X 12 Is CRFG2028 Width_14in

Every grille has a front end frame

Actual Filter Size – 7 3/4"w x 29 3/4" x 1"

+ Product Details Size – 26" x 30" or 30" x 26" is the size for the duct opening measurement only

+ Product Details Size – 14" x 28" or 28" x 14" is the size for the duct opening measurement only

+ Product Details Size - 14"w X 26"h X 2"d (for duct opening measurement only)

36"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 23.75"h] 14" Diameter Every grille has a front 4 X 12 Is CRFG2028 Width_14in Every grille has a front end frame Actual Filter Size – 7 3 4"w x 29 3 4" x 1"