14" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return so you are not left

so you are not left with much waste

actual front end outer dimensions are approximately 10 5/8" width X 36 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

+ Product Details Size - 24"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

14" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return so you are not left+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 6" or 6" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 5. 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 Made