14" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in Filter Size - 21

Filter Size - 21

+ Product Details Size – 14"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 6" X 6" is the size for the duct opening measurement only

+ Product Details Size - 18"w X 4"h is the size for the duct opening measurement only

14" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in Filter Size - 21+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 8" or 8" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 7. 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