14" x 32" or 32" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are 21

7/8" Insulated Copper Coil Line - Seamless Pipe Tube for HVAC

+ Product Details Size - 20"w X 14"h is the size for the duct opening measurement only

rated at R3

14" x 32" or 32" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 32" OR 32" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 31. 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