36" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 22 5/8" height -

Whether installed on a sidewall or ceiling

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

+ Product Spec Sheet Round Ceiling Diffuser Spec Sheet

36" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 22" OR 22" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 21. 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