36"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 21.75"h] Fixed Blades + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 26"w X 16"h is the size for the duct opening measurement only

180 Degrees Double Direction Adjustable - Fins Are Manually Adjustable Individually for Optimal Air Distribution

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 16" or 16" x 10" duct opening (measured at the opening)

Actual Front End Outer Dimensions Are 12" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

1/4” - 6518 PSI

36"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 21.75"h] Fixed Blades + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 26"w X 16"h is the size for the duct opening measurement only 180 Degrees Double Direction Adjustable Fins Are Manually Adjustable Individually for Optimal Air Distribution