16"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 17.75"w x 17.75"h] flat stamped steel high-impact clear plastic for long-lasting 9" Diameter RFG1424 Black-HP Product Details Size 10

high-impact clear plastic for long-lasting performance

+ Product Details Size - 6"w X 8"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening)

actual front end outer dimensions are approximately 19

16"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh White [Outer Dimensions 17.75"w x 17.75"h] flat stamped steel high impact clear plastic for long lasting 9" Diameter RFG1424 Black HP Product Details Size 10 high impact clear plastic for long lasting performance + Product Details Size 6"w X 8"h X 2"d (for duct opening measurement only)