12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 13.75"w x 13.75"h] Return + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

Design – Fixed Hinged for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size – 10" round duct opening-

14" x 8" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

Adjustable airflow control – Adjustable airflow control: The system allows users to customize the amount of air supply

12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 13.75"w x 13.75"h] Return + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only Design – Fixed Hinged for easy filter change & cleaning uses a 1" thick filter