18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 8" duct openings

+ Product Details Size – 14" X 4" is the size for the duct opening (floor/vent hole) measurement only

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875" width X 18" height

Actual Front End Outer Dimensions Are 26" Width X 8" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Bar Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 16" OR 16" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 15. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum