22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 15 3/4" x 1"

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

+ Product Details Size – 12" x 34" or 34" x 12" is the size for the duct opening measurement only

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Actual Filter Size – 21 3/4"w x 5 3/4" x 1"

22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black Actual Filter Size – 24+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 36" OR 36" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 35. 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