30" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille + Product Details Size –

+ Product Details Size – 20"w X 24"h is the size for the duct opening measurement only

For a visual guide on how to measure your vent hole before ordering a grille

actual front end outer dimensions are approximately 12 5/8" width X 36 5/8" height

+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 18" duct openings

30" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 35. 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