28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter 75" Width X 25

75" Width X 25

+ Product Details Size – 12" x 32" or 32" x 12" is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

and sound level range of NC 25 to 35

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 20" duct opening (measured at the opening)

28" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter 75" Width X 25+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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