36"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 31.75"h] Compatible with Duct 10" + Product Details Size - Width_20in These won t hinder RFG1620 FBA

+ Product Details Size - 4"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 24 5/8" height

+ Product Details Size - 34"w X 26"h is the size for the duct opening measurement only

5/8" - 2579 PSI

crafted from heavy gauge steel for unparalleled durability

36"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 31.75"h] Compatible with Duct 10" + Product Details Size Width_20in These won t hinder RFG1620 FBA + Product Details Size 4"w X 30"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 34 5 8" width X 24 5 8" height