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 This versatile guard features air accordion content RFG2525 Black-HP 18" Round Duct Pipe

This versatile guard features air circulating ports on all four sides to allow proper airflow

+ Product Details Size - 8"w X 10"h X 2"d (for duct opening measurement only)

7/8” - 3397 PSI

The premium durable material guarantees that they will never rust or wear through

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

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 This versatile guard features air accordion content RFG2525 Black HP 18" Round Duct Pipe This versatile guard features air circulating ports on all four sides to allow proper airflow + Product Details Size 8"w X 10"h X 2"d (for duct opening measurement only)