24"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 35.75"h] Compatible With Duct 12in + Product Details Perfect Fit Product Details Size 14 Material_Anodized Aluminum LR164

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

Actual Filter Size – 17 3/4"w x 27 3/4" x 1"

actual front end outer dimensions are approximately 7

With Insect Net That Will Prevent Mousquitos and Insects From Entering

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 16" OR 16" x 20" duct opening (measured at the opening)

24"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 25.75"w x 35.75"h] Compatible With Duct 12in + Product Details Perfect Fit Product Details Size 14 Material_Anodized Aluminum LR164 + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening) Actual Filter Size – 17 3 4"w x 27 3 4" x 1"