26" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter + Product Details Size –

+ Product Details Size – 26" x 36" or 36" x 26" is the size for the duct opening measurement only

+ Product Details Size – 25"w X 22"h is the size for the duct opening measurement only

Our Aluminum Ceiling Diffuser is not only a design marvel but also a practical choice for your HVAC system

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+ Product Details Size – 22"w X 6"h is the size for the duct opening measurement only

26" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 34" OR 34" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 33. 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