26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 21.75"h] with filter Actual Filter Size – 31 8 Feet Long Quality Packaging carefully packaged RG1620AL

Actual Filter Size – 31 3/4"w x 29 3/4" x 1"

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

Easy Unrestricted Air Flow For Your HVAC System

+ Product Details Size - 30"w X 2"h is the size for the duct opening measurement only

Performance – High diffusion induction rates result in rapid temperature and velocity equalization of the mixed air mass well above the zone of occupancy

26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 27.75"w x 21.75"h] with filter Actual Filter Size – 31 8 Feet Long Quality Packaging carefully packaged RG1620AL Actual Filter Size – 31 3 4"w x 29 3 4" x 1" + Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only