6"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 23.75"h] 6" Diameter Design – Removable frame for 4 X 12 Is CRFG2028 Width_14in

Design – Removable frame for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size - 25"w X 30"h is the size for the duct opening measurement only

4" X 14" Brass Victorian Floor Register Grille - Modern Contempo Decorative Grate - HVAC Vent Duct Cover - Brass Plated

Pressure Rating: 2100 to 7000 PSI

+ Product Details Size – 14"w X 36"h is the size for the duct opening measurement only

6"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 7.75"w x 23.75"h] 6" Diameter Design – Removable frame for 4 X 12 Is CRFG2028 Width_14in Design – Removable frame for easy filter change & cleaning uses a 1" thick filter + Product Details Size 25"w X 30"h is the size for the duct opening measurement only