34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –

+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height

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

+ Product Details Size – 14"w X 16"h is the size for the duct opening measurement only

34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 14" Or 14" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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