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

actual front end outer dimensions are approximately 21

+ Product Details Size – 36"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 30" x 36" or 36" x 30" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 32 5/8" height -

Actual Filter Size – 25 3/4"w x 5 3/4" x 1"

24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 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