16"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 17.75"w x 9.75"h] Aluminum Slim Sliding Metal Damper To Compatible with Duct 4" Product Details Size 32 LO246

Slim Sliding Metal Damper To Control and Adjust Airflow

actual front end outer dimensions are 9

our Butterfly Damper simplifies the process of managing airflow

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

16"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 17.75"w x 9.75"h] Aluminum Slim Sliding Metal Damper To Compatible with Duct 4" Product Details Size 32 LO246 Slim Sliding Metal Damper To Control and Adjust Airflow actual front end outer dimensions are 9