26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return High Quality ABS Plastic -

High Quality ABS Plastic - Will Last Forever & NEVER RUST

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 36" or 36" x 10" duct opening (measured at the opening)

+ Product Details Size - 36"w X 20"h is the size for the duct opening measurement only

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

26" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return High Quality ABS Plastic -+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 24" OR 24" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 23. 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