36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions

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

+ Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only

angle the louvers up for efficient cooling

+ Product Details Size - 14"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 28 5/8" height

36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 14" OR 14" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 13. 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