20"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 17.75"h] Copper Coil + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 26" x 32" or 32" x 26" is the size for the duct opening measurement only

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

+ Product Details Size – 18" x 24" or 24" x 18" is the size for the duct opening measurement only

Measure the size of the air duct/drywall opening

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

20"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 17.75"h] Copper Coil + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 26" x 32" or 32" x 26" is the size for the duct opening measurement only + Product Description Maximize the efficiency of your ventilation system with our top of the line HVAC grilles and registers