32"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 27.75"h] 12" Diameter if your hole is 20" 14" Round Duct Pipe FR M 414 White For 10 duct opening

if your hole is 20" wide by 14" tall

provide precise damper control and superior air dispersion

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening)

+ Product Details Size - 36"w X 16"h is the size for the duct opening measurement only

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32"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 33.75"w x 27.75"h] 12" Diameter if your hole is 20" 14" Round Duct Pipe FR M 414 White For 10 duct opening if your hole is 20" wide by 14" tall provide precise damper control and superior air dispersion