26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood actual front end outer dimensions

actual front end outer dimensions are 21

Actual Filter Size – 31 3/4"w x 27 3/4" x 1"

+ Product Details Size – 8"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 12"h X 2"d (for duct opening measurement only)

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26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 19. 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