12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18in diameter We carry sizes the big

We carry sizes the big box stores don't

actual front end outer dimensions are approximately 32 5/8" width X 34 5/8" height

How To Measure A Grille

75"H – fits a 10" x 8" duct opening

actual front end outer dimensions are approximately 12 5/8" width X 26 5/8" height

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18in diameter We carry sizes the big+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 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