30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –

+ Product Details Size – 8" x 34" or 34" x 8" is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 38 5/8" width X 36 5/8" height

+ Product Details Size - 10"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 25"h is the size for the duct opening measurement only

30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 10" OR 10" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 9. 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