30" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Measure the size of the

Measure the size of the air duct/drywall opening

actual front end outer dimensions are approximately 30 5/8" width X 28 5/8" height

actual front end outer dimensions are approximately 5

actual front end outer dimensions are approximately 22 5/8" width X 32 5/8" height

designed to distribute air evenly throughout your space

30" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Measure the size of the+ 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