36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size –

+ Product Details Size – 32"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 32"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 10 5/8" height

+ Product Details Size - 26"w X 24"h is the size for the duct opening measurement only

36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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 Made from