16" x 18" or 18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 9 3/4" x 1"

+ Product Details Size – 26"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 31 5/8" height

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16" x 18" or 18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way Actual Filter Size – 23+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 18" OR 18" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 17. 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