28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set + Product Details Size –

+ Product Details Size – 8" x 30" or 30" x 8" is the size for the duct opening measurement only

+ Product Details Size – 8"w X 6"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

actual front end outer dimensions are approximately 18 5/8" width X 32 5/8" height -

28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 29. 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 Made from