26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades 4" X 14" Is The

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

actual front end outer dimensions are approximately 30 5/8" width X 38 5/8" height

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+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Fixed Blades 4" X 14" Is The+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 12" OR 12" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 11. 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