16" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum 18" Round Duct Pipe + Product Details Size –

+ Product Details Size – 4"w X 14"h is the size for the duct opening measurement only

Filter Size - 23

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

+ Product Details Size - 28"w X 12"h is the size for the duct opening measurement only

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16" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum 18" Round Duct Pipe + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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 Made from