32" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille + Product Details Size -

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 30"w X 28"h is the size for the duct opening measurement only

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

+ Product Details Size – 22" x 36" or 36" x 22" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 6" OR 6" X 16" duct opening (measured at the opening)

32" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 22" OR 22" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 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