26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum } /* Added styles for

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The integral multi-shutter damper with a convenient handle operator ensures that you can easily adjust the air volume

Actual Filter Size – 27 3/4"w x 23 3/4" x 1"

+ Product Details Size – 28" x 34" or 34" x 28" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 27 5/8" height

26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum } /* Added styles for+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 18" OR 18" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 17. 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