30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Brown We carry sizes the big

We carry sizes the big box stores don't

powder-coated steel

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening)

actual front end outer dimensions are approximately 18 5/8" width X 38 5/8" height

30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Brown We carry sizes the big+ 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