18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter 75"H – fits a 16"

75"H – fits a 16" X 10" duct opening

or commercial environments

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening)

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 32" or 32" x 8" duct opening (measured at the opening)

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter 75"H – fits a 16"+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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