30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size –

+ Product Details Size – 18" x 24" or 24" x 18" is the size for the duct opening measurement only

High Standard Quality - Every part is hand inspected for quality before it is packaged

+ Product Details Size – 34"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 16 5/8" height

30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 24" OR 24" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 23. 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