18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 background: #f8f9fb

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listed size +1

+ Product Details Size - 14" X 14" is the size for the duct opening measurement only

+ Product Details Size - 30"w X 30"h X 2"d (for duct opening measurement only)

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 background: #f8f9fb+ 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