28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 31 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 20" or 20" x 8" duct opening (measured at the opening)

+ Product Details Size – 32"w X 8"h is the size for the duct opening measurement only

Design – removable door/face for easy filter change & cleaning - uses a 1" thick filter

28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 17+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 8" OR 8" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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