34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 3-Way or 4-Way + Product Details Size –

+ Product Details Size – 14"w X 25"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 22" OR 22" x 36" duct opening (measured at the opening)

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

+ Product Details Size – 26" x 30" or 30" x 26" is the size for the duct opening measurement only

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34" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 3-Way or 4-Way + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 29. 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