14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 accordion-content { display: none

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

this easy-to-install grille fits seamlessly into any standard return filter opening

8" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

actual front end outer dimensions are approximately 26 5/8" width X 14 5/8" height

14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 accordion-content { display: none+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 34" OR 34" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 33. 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