20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening)

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+ Product Details Size - 18"w X 18"h X 2"d (for duct opening measurement only)

Design – Rigid gauge ABS plastic

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 27. 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