26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set + Product Details Size –

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

+ Product Details Size - 36"w X 4"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 6" OR 6" x 24" duct opening (measured at the opening)

+ Product Details Size - 4"w X 30"h is the size for the duct opening measurement only

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26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 22" OR 22" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 21. 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