14" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 + Product Details Size –

+ Product Details Size – 28"w X 16"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 24" OR 24" X 16" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 34" OR 34" x 18" duct opening (measured at the opening)

With plain ends

+ Product Spec Sheet Lay-In 3 Coned Spec Sheet

14" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 12" or 12" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 11. 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