14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 7 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 12" or 12" x 6" duct opening (measured at the opening)

actual front end outer dimensions are approximately 34 5/8" width X 16 5/8" height

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

14" x 34" or 34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall Actual Filter Size – 7+ 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