34"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 35.75"h] w26h26 + Product Details Perfect Fit Product Description Enhance your CRFG68 Victorian Floor Registers

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 12" or 12" x 14" duct opening (measured at the opening)

+ Product Details Size - 28"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

+ Product Details Size - 10"w X 24"h X 2"d (for duct opening measurement only)

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

34"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 35.75"w x 35.75"h] w26h26 + Product Details Perfect Fit Product Description Enhance your CRFG68 Victorian Floor Registers + Product Details Perfect Fit & Easy Sizing Designed for a 14" x 12" or 12" x 14" duct opening (measured at the opening) + Product Details Size 28"w X 30"h is the size for the duct opening measurement only